Specialists in electronic kits, components and products.KC5225: 10A DC SPEED CONTROL Silicon Chip Magazine June 1997 (p26 to p30) Rev 2.2 Batch No: Silicon Chip Magazine June 1997 CONSTRUCTION GUIDE KIT REQUIRES KIT INCLUDES PLEASE READ BEFORE COMMENCING CONSTRUCTION The guarantee on this kit is limited to the replacement of faulty parts only, as we cannot guarantee the labour content you provide. "For Semiconductor Guarantee, see `Terms and Conditions' In our catalogue. Our Service Department does not do general service on simple kits and it is recommended that if a kit builder does not have enough knowledge to diagnose faults, that the project should not be started unless assistance can be obtained. Unfortunately, one small faulty solder joint or wiring mistake can take many hours to locate and at normal service rates the service charge could well be more than the total cost of the kit. If you believe that you may have difficulty in building this kit (which is simply a complete set of separate parts made up to a list provided by the major electronics magazines) and you cannot get assistance from a friend, we suggest you return the kit to us IN ITS ORIGINAL CONDITION for a refund under our satisfaction guarantee. Unfortunately, kits cannot be replaced under our satisfaction guarantee once construction has been commenced. CONTACTS: For functional or modification queries please contact Silicon Chip Publications who have designed and/or published this project: www.siliconchip.com.au
[email protected] Silicon Chip Publications, POBox 139, Collaroy Beach, NSW 2097 For quality issues and/or constructive feedback please contact the Production Manager at Jaycar Electronics and provide the following information: • Product Number • Batch No • Details of Quality Issue JAYCAR ELECTRONICS PTY LTD (ABN 65 000 087 936), 100 SILVERWATER RD, SILVERWATER, NSW 2128, AUSTRALIA Tel: (02) 9741 8555 Fax (02) 9741 8500 www.jaycar.com.au
[email protected] 1 of 1 com. SILVERWATER. SC 10/1998 The text on page 30 states that you should be able to measure about +12V at pin 16. NSW 2128.. The text states "Make sure that they (the diodes) are connected in the right direction across the motor. ie..com. JAYCAR ELECTRONICS PTY LTD (ABN 65 000 087 936). as shown in the circuit and wiring diagrams.Specialists in electronic kits. anodes to the positive supply line.jaycar. SC 08/1997 There is a mistake in the text on page 30. Nevertheless the 2 capacitors will not fit flush onto the pcb. Pin 16 is grounded - it should refer to pin12. third paragraph down..au 2 of 2 . AUSTRALIA Tel: (02) 9741 8555 Fax (02) 9741 8500 www. before starting construction." The diode(s) should be connected with cathode to the positive supply line. KC5225: 10A DC SPEED CONTROL Silicon Chip Magazine June 1997 (p26 to p30) Rev 2. Jaycar has substituted one of the capacitors with a 100uF/25V to address this issue. Jaycar Electronics has revised the Pcb to address the capacitor fitting issue (see left) and to accommodate both 5 & 10mm VR1 trimpots.2 Notes and Errata (at time of print): It is recommended to check the designers/publishers website for further notes and errata since this document was issued. of IC1. components and products. Jaycar Electronics: The component spacing for the 2 * 100uF/63V(50V) capacitors on the Pcb is insufficient. 100 SILVERWATER RD.au kits@jaycar. SILVERWATER. When purchasing individual items separately.au 3 of 3 .2 Possible Substitutions Original Part Original Part Desc Subst Part Subst. NSW 2128.5W METFILM 1% PKT 8 Brown Black Black Red Brown RR0602 1 18K .5W METFILM 1% PKT 8 Brown Gray Black Red Brown JAYCAR ELECTRONICS PTY LTD (ABN 65 000 087 936).au
[email protected] PIN 0.# Qty* Description Component Identification And/Or Location HP1250 4 P.jaycar. 100 SILVERWATER RD. components and products. EC7839 PCB SC11106971 SPEED CONTR EC7978 PCB (KC5225) SC11106971 REV2 SC06/97 RE6066 10uF 16V Electrolytic RE6070 10uF 25V Electrolytic RT4310 5k horizontal trimpot RT4358 5k horizontal trimpot (piher) and adjust the pins.com.com. 1 2 See section about Substitution See section about Notes & Errata RESISTOR(S) Cat. KC5225: 10A DC SPEED CONTROL Silicon Chip Magazine June 1997 (p26 to p30) Rev 2.5W METFILM 1% PKT 8 Red Red Black Brown Brown RR0588 1 4K7 .5W METFILM 1% PKT 8 Yellow Purple Black Brown Brown RR0596 1 10K .9MM PKT 50 RR0580 2 2K2 . Silicon Chip 100uF/50V on the input side of the RE6150 100uF/63V on the input side of the 12V 12V regulator regulator Silicon Chip 100uF/50V on the output side of the RE6130 100/25V used on the output side of the 12V regulator 12V regulator PARTS LIST Please note that quantities listed refer to the actual number of items required. Part Desc. take pack quantities into account.Specialists in electronic kits. AUSTRALIA Tel: (02) 9741 8555 Fax (02) 9741 8500 www. 1UF 100NF 100V MKT POLY 0. NSW 2128.22uF / u22 / 220n / 224 SEMICONDUCTOR(S) Cat.Specialists in electronic kits.068uF / 68n / 683 RM7125 2 .jaycar.# Qty* Description Component Identification And/Or Location 2 EC7978 1 PCB (KC5225) SC11106971 REV2 SC06/97 SEE NOTES AND ERRATA NS3015 50m SOLDER 60/40 1MM 1KG RL JAYCAR ELECTRONICS PTY LTD (ABN 65 000 087 936). 100 SILVERWATER RD.068UF 68NF 100V MKT POLY 0. SILVERWATER.au
[email protected] 4 of 4 .com.# Qty* Description Component Identification And/Or Location RE6066 2 10U/16VRB ELECT CAPACITOR 10uF / 16V 2 RE6140 1 100U/25VRB ELECT CAPACITOR 100uF / 25V Output Side of the 12V Regulator.1uF / u1 / 100n / 104 RM7145 1 .5W METFILM 1% PKT 8 Brown Black Black Yellow Brown RR1518 2 4R7 5% 1/4W CARB RES PKT 8 Yellow Purple Gold Gold RR3274 1 100 OHM 5W W/W RESISTOR RT4310 1 5K OHM HORZ MIN T-POT 502 CAPACITOR(S) Cat. components and products.5W METFILM 1% PKT 8 Yellow Purple Black Red Brown RR0620 1 100K .5W METFILM 1% PKT 8 Red Black Black Red Brown RR0612 2 47K . AUSTRALIA Tel: (02) 9741 8555 Fax (02) 9741 8500 www.com. next to the IC RE6150 1 100U/63VRB ELECT CAPACITOR 100uF / 63V RM7115 1 .22UF 220NF 100V MKT POLY 0.5W METFILM 1% PKT 8 Brown Black Black Orange Brown RR0644 1 1 M . KC5225: 10A DC SPEED CONTROL Silicon Chip Magazine June 1997 (p26 to p30) Rev 2.2 RR0603 1 20K .# Qty* Description Component Identification And/Or Location PI6502 1 16 PIN IC SOCKET PCB TIN/G ZK8850 1 UA494/ TL494 SWITCHMODE IC UA494/TL494 ZR1014 1 1N5404 3A 400V DIODE 1N5404 2 ZR1030 1 MUR1560/STTA1206D FAST RECOVERY D2 DIODE MURI 560 ZT2179 1 BC639 NPN 80V 1A SIG TO92 BC639 ZT2180 1 BC640 PNP 80V 1A SIG TO92 BC640 ZT2450 1 STP60NE06 / BUK456-60 N-CH FET *** STP60NE06 / BUK45660 ZV1512 1 7812 +12V 1AMP TO-220 7812 / LM340T12 HARDWARE / WIRE(S) / MISCELLANEOUS Cat. the diode and capacitor are not required. you can do it now rates a soft start feature which is desirable to reduce inrush currents. operating 12V audio equipment in 24V causes premature wear of the fuel In the future. water/air intercoolers & water injection on The circuit can control 12V loads modified performance cars. It could also be up to 20 amps and it uses just two Mosfets to do it. full bore all the time is wasteful of the off to the fuel tank to keep the pres. using the cars map sensor output as a measure of fuel can be used for controlling 12V DC motors in demand. Circuit description The heart of the circuit shown in Fig. and the excess fuel is bled as the two Mosfets. The circuit has excellent line and speed regulation These days.1 is a TL494 pulse width modula- tion (PWM) controller. for some pump applications the soft start may not be wanted and so well tell you how to disable it. for doing this is beyond the scope of this article. As presented. The PC board has all components on it except for a diode (D2) and a capacitor which must be wired across the motor being driven. PWM circuit are for control of 12V and 24V motors in model locomotives and cars and in control applications Design by RICK WALTERS in manufacturing. Because the Mosfets are being 26 SILICON CHIP . How- ever. The pump runs In the meantime. the exact method cars. We are presenting this project as a standalone PC board. If you want to put it in a case it is a simple matter to install it in a suitable plastic box but that will be up to you. Note: this circuit is not suitable for battery/electrical system and also sure constant. It varies the output voltage fed to the motor by This small PC board will provide speed control of 12V or 24V motors drawing rapidly turning Mosfets Q3 & Q4 on up to 20A. Examples are pumps for fuel injection. However. the circuit incorpo- fuel injection cars. Not shown on this prototype board is the input protection diode D1 and off. A prime example of this is the fuel pumps which are variable speed around 2kHz. most cars will have vehicles since its output is pulsed at pump. If the circuit is used to control incandescent lamps. used for headlight dimming in the daytime & for Other possible applications for this running 12V motors & pumps in 24V vehicles. Please check Notes & Errata particularly if the device is used to at the beginning of this document control 12V incandescent lamps. pump use to pressurise the fuel rail in controlled according to fuel demand. car manufacturers are continuously. regardless of the fuel and uses just one low-cost IC as well coming to realise that running pumps demand.A high-current motor speed control for 12V & 24V systems This pulse width-modulated 20A speed control with this design. the com. ranging from +7V to +40V. and off. together with the gates of Q3 & input driven from the oscillator. of the on time to the off time cle must be able to be controlled over Note that the TL494 is normally controls the amount of power fed to a wide range. swing from 0V to +12V and so the Two comparators (pins 1. Q4. back to the required level. ie. This improves the switching A flipflop driven by the dead time verse applies for falling output volt. used as emitter followers to pull the An oscillator. gate drive signal is limited to this volt- 16) with their outputs ORed together age. The 2.2.2kW which is determined by a capacitor at output voltage rises slightly.1: the heart of the circuit is a TL494 pulse width modulation (PWM) controller. Q2. 15 & tor input equal to the reference volt. dissipate very little power. Thus. If the bases of Q1 & Q2 to +12V. the turn-on and turn-off times and Two 200mA transistors with un. However. met with REG1. Its oscillator is set to it is important that the gate drive to handling currents as high as 20 amps run at 2kHz and it produces a pulse Mosfets Q3 & Q4 does not exceed their total. action of the Mosfets. The con. even when ates as follows. The chip fed to one input of one of the compa. collectors (pins 8 & 11). Note that diode D2 is essential to the circuit operation. Q1 & Q2 are included for another A PWM comparator with one input ing pulse on time. 2. It varies the output voltage fed to the motor by rapidly turning Mosfets Q3 & Q4 on and off. Its block A fraction of the output voltage is and C2 pin 11) have their collectors diagram is shown in Fig. we see that the TL494 is tion in the Mosfets. it speeds up and PWM comparators. the frequency of nected to a reference voltage. resistor at pins 9 & 10 is the common pin 5 and a resistor at pin 6. while the other input is con. ages. thereby bringing the output voltage the Mosfets each time they turn on tors. they In simple terms. heatsinks (depending on the output pulse width modulated) and the ratio In this circuit. the TL494 oper. This is done by reducing the driv. This means that they do not get train at its outputs at this frequency. reducing the time reason and that is to rapidly charge from the oscillator and the other from the switching device is turned on. age. Now if we refer to the circuit of thereby reduces the power dissipa- committed emitters (pins 9 & 10) and Fig. motor. the emitters of Q1 & A dead time comparator with one and consequently the output voltage. specifications and so this condition is very hot and no heatsink or very small The width of the pulses is varied (ie. parator input will sense this change emitter load and it pulls the bases to A stable +5V reference at pin 14. connected to the +12V supply and are contains the following functions: rators. the two internal transistors (C1 pin 8 tually any PWM application. Please check Notes & Errata at the beginning of this document Fig. since it can operate with a supply A soft start circuit is incorporated JUNE 1997 27 . the output duty cy- current) are required. with their fed via a 7812 12V regulator. switched fully on or fully off.1 again. from virtually zero up to used in switchmode power supply the load which in this case is the the maximum of around 90% and so applications but it is suitable for vir. and discharge the gate capacitances of the ORed output of the two compara. This keeps the voltage at the compara. This is bases driven by the outputs of the not strictly essential for the TL494 Soft start flipflop. and will alter the output on-off ratio ground. via diodes (pin 3). pin 1. 20kW and 2. D2 must be a fast recovery diode be- is no output from pins 9 & 10. to reduce surge current into the motor that on pin 1 of IC1 (nominally 1.22mF capacitor C3 width will increase. the reference voltage on The importance of diode D2 and will gradually fall and the output pulse pin 1 of IC1 is fixed and referred to the the associated 0. most 80V peak-to-peak.terminal the motor itself: D2 and C3.3 shows the circuit age precisely. the input volt.2: functional block diagram of the TL494. about 74%. is also fed through Protection mous spike voltage amounting to al- a 47kW resistor to pin 2. the generation of excessive voltage tween pins 14 and 4 is initially dis. will vary in a direct relation to the Now have a look at Fig.output and driving a resistive load which could sides of the motor. When power is first ap. Notice the enor- speed control. The voltage sate for this. the REF output. each time the When the speed control wiper is at vided by diode D1.7kW resistors and fed through a and pin 1 of the TL494 we compen. Mosfets. 28 SILICON CHIP . minimum setting (ie. As thereby applying a larger voltage to cause of the very fast switching of the capacitor C2 charges through the the motor so it can run. The scopes vertical sen- 47kW resistor to pin 2. giving a smooth 5V reference at pin 14. This pulls the INH(hibit). the voltage between MO.4V. 4. resistive load. the voltage at spikes. the TL494 monitors both between the MOTOR. Diode D2 C1.8V across the load. 0V). By connecting the the circuit set for the same output TOR. In our case this is demonstrated in the oscilloscope rise in the output voltage. be a heater element or an incandes- age before the 12V regulator (MOTOR This means that as we vary the sup. Reverse polarity protection is pro.2kW voltage divider resis.3. the voltage average but has a one-off surge rating This spike voltage is enough to blow at the junction of the 18kW and 47kW of 200A and will blow the fuse if the the Mosfets because their Drain-Source resistors will be forced to be twice leads to the battery are reversed. each time the Mosfets turn off. This chip is intended mainly for switchmode power supplies but we have adapted it to control motors and resistive loads. board but are wired directly across charges its associated 10mF capacitor. Notice that the waveform +) and the voltage at the Mosfet Drains ply voltage. as the voltage drop circuit are not mounted on the PC plied. TOR. pin 14. The voltage at the MOTOR. is a clean pulse with a duty cycle of (MOTOR -). 5 & 6. will not run. sitivity has been changed to 20V/div tapped off the +5V reference by the instead of 5V/div. ie. This shows tors to comparator 1. VR1. The MO. 100kW resistor the voltage on pin 4 Normally.4. charged. Fig. pin 4. for +14V input).7kW resistor).voltage is attenuated by the 18kW 20kW resistor between the input rail when driving a motor instead of a and 4. rapidly across each 47kW resistor will be 1. voltage sensed and regulated by IC1 is waveform in Fig. cent lamp.terminal will decrease. It is rated at 3A Mosfets turn off. would not be desirable as the output waveforms of Figs.and ground will be held con. While pin 4 pin is high there the MOTOR. will be about +14V and so the motor is the most important as it prevents high as the 10mF capacitor (C2) be. ground (across the 4. voltage change. voltage rating (VDS) is only 60V. As VR1 is advanced. This gives a voltage of The MOTOR+ voltage is fed via the stant but the voltage across the motor about 8. The In order to control the output volt.4V Two essential components to the at turn on. 3 but driving a motor instead of a incandescent lamp. radiating commutator hash which PC board assembly showing a value about half of that could otherwise interfere with sensi. Fig. tive circuitry elsewhere in the car. also not mounted on the PC lay is shown in Fig.8V across the load.4: this waveform shows the circuit set for the same resistive load which could be a heater element or an output as for Fig. Fig. or open tracks. The capacitor much use connecting a 5A diode checking the copper pattern against has a filtering effect. The PC board for this design is coded applied by the control circuit. it will the PC artwork (Fig. The component over- The reason that diode D2 and the Finally. We now see the motors Note that the capacitor has a filtering effect which acts to back-EMF during the Mosfet off period. Its not a few components on it. 11106971 and measures 68 x 50mm. removing most of across a motor that pulls 20A. 0. This spike voltage is enough to blow the Mosfets because their Drain-Source voltage rating (VDS) is only 60V.4 but with D2 connected across the diode D2 and the 0. method stops the motor leads from EMF during the Mosfet off period. motor to clip the voltage spikes. It Finally. enormous spike voltage (amounting to almost 80V p-p) each time the Mosfets turn off. Fig.22mF capacitor suit the rating of the motor. commutator. The scopes vertical sensitivity has been pulse with a duty cycle of about 74%. This tions but with diode D2 connected across the motor instead of being must also match the rating of the mo- across the motor to clip the voltage mounted on the PC board is that this tor.3: this scope capture shows the waveform across a Fig. Notice that the waveform is a clean resistive load.6 shows the effect when The current rating of diode D2 must is fairly easy to assemble as it only has both the diode and 0.8) and repair any the hash generated by the motors just blow the diode and then blow the defects such as undrilled holes.22mF capacitor C3 are fitted directly board is the in-line input fuse F1.5 shows the same circuit condi. This gives a changed to 20V/div instead of 5V/div.7. Notice the voltage of about 8. Begin by are fitted to the circuit. JUNE 1997 29 .22mF capacitor are fitted to the circuit. spikes. Mosfets. shorts commutator. showing a value remove most of the hash generated by the motors about half of that applied by the control circuit. We now see the motors back.Fig.5: this waveform was produced with the same circuit Fig.6: this scope waveform shows the effect when both conditions as for Fig. If able to measure about +12V on pin 16 2 100mF 50VW PC electrolytic connected the other way around. The BUK456-60s Resistors (0.068mF MKT polycarbonate pends on the current drawn by the across the 100W resistor it should read controlled device. Be careful not to burn yourself as candescent loads.8: actual size artwork for the PC board. Obviously a 20A fuse quire with trimpot VR1 and use the If you want the full 20A load current. ie. 68 necessary but they must be included If you are careful with the assem.22mF 100VW MKT C2 should be an MKT polycarbonate 12V input. If these values are OK pro. to connect a 1kW 1W resistor across use one Mosfet. the MTP60N06 is a more 1 20kW 2 4. followed by the the maximum output will be about pacitor C2. It has an on resist- 1 18kW 1 100W 5W (testing) time of 10%. whatever load you wish to drive. the 100W resistor will become hot at tor loads.5V. For As noted above. Make +12V battery.7W Because IC1 has an internal dead suitable device. then connect the controller directly to a 1 or 2 BUK456-60A/B/H use two MUR1515s in parallel. Please check Please check Notes & Errata Notes & Errata at the beginning of this at the beginning of this document document Fig.25W. polycarbonate (C3) capacitor with a rating of at least ceed with the following tests. you should be Capacitors anodes to the positive supply line. A suitable cheap diode is the a variable power supply. regardless of bly. Rotate trimpot VR1 slowly specified are readily available and 1 1MW 1 10kW anticlockwise and the voltage should Please check have an on resistance of . using a only be turned on for 90% of the time will not protect a 1A motor. Turn VR1 1 5kW PC trimpot (VR1) at theNotes & Errata beginning of this its current rating.7kW Notes & Errata increase up to about 12V when fully at the beginning of this If you want high currents and 24V 2 47kW 2 2. operation. fully clockwise (minimum speed) and Semiconductors document D2 must be rated to handle a cur- solder a resistor of around 100W 5W 1 TL494CN switching regulator rent at least equal to that drawn by the across the motor terminals.Q4) sure that they are connected in the With the negative meter lead con. it should work first up. If you have (IC1) motor. This done. capacitors and the Mosfets. However. Fig. ity. small heatsinks. The type of FET used de- If you now connect the meter leads 1 . You higher currents. code 11106971. plan to drive. D2 and C3 are not Testing 1 PC board. Please check Notes & Errata at the beginning of this document Fit and solder the resistors. 2 0. have a power supply you will have to 1 BC640 PNP transistor (Q2) If you want to run a 20A motor. x 50mm Please check when driving any motor.1. it can be disabled by omitting ca- and trimpot VR1. the rating of the in. Provided a small the output terminals and then place a heatsink is fitted you can probably Using the speed controller switch in series with the motor or draw up to 10A with one Mosfet. cut pigtail from one of them for the and the output voltage will never be If you dont want the soft-start facil- one link. soft-start facility be included for in- If you intend to operate the control. We recommend that the transistors.1mF MKT polycarbonate 100VW. +1. feed 14V to 1 7812 regulator (REG1)1 MUR1515 which is rated at 150V 15A the DC input and ground. 1 100kW 1 4. N-channel Mosfets (Q3. a better approach would be tend to draw more than 6A you can the maximum setting of VR1. in-line switch to connect and discon- both Mosfets should be fitted with nect the motor. nected to the 0V line.01W. For 14V input. 1%) zero volts.2V with 1 0. SC 30 SILICON CHIP . two Mosfets must be line fuse will depend on the load you then set up the drive voltage you re- used. the output devices can ance of . as shown on the circuit of Fig. If you dont 1 BC639 NPN transistor (Q1) and should cover most applications. 12. REG1 the same as the input. The voltage 2 10mF 16VW PC electrolytic will blow the fuse and perhaps the on pin 1 of IC1 should be around (C1. right direction across the motor.4V with 14V input and +1. you and +5V on pin 14 of IC1. PARTS LIST If resistive or incandescent loads are to be driven. for mo- ler from a 12V battery and dont in.C2) Mosfets too.2kW document rotated.7: the component overlay for the PC board. fit the IC.028W. LM320 B B TO-92 Body has pin PNP Bottom view C E assignments depending OUTPUT C on the sub type indicated TO-92 in brackets. 104 0.0047uF 4. 473 Symbol Component V= IxR The formulas are: 0.047uF 47nF .1 . 0.22nF 220pF 221 0. 105 K . voltage and current is determined by Ohm’s Law (*).00 MH 1N4728 3V3 1N4744 15V K . Regulator K .0 . COMPONENT IDENTIFICATION COMPONENT IDENTIFICATION COMPONENT IDENTIFICATION VOLTAGE REGULATORS RESISTOR COLOUR CODES This section will help you to match some of the symbols used in LED's schematics (electronic circuit diagrams) to the physical VOLTAGE REGULATORS Symbol component used in the actual product.1uF 100nF .1% = 4K7 1% C (A) C E Metal area behind Bottom view Plastic area (FET) INPUT (4 BAND) (front) orange-purple-yellow-gold E (K) B (G) OUTPUT (2) INPUT (1) = 3 .001uF 1nF 1000pF 102 resistance. A + COMMON RESISTORS Top view Component A + Symbol Component OUTPUT POSITIVE REGULATOR 4 or 5 Band COMMON TO-220 PACKAGE ¼ or ½ Watt INPUT 78XX. LM320 BLACK 0 0 0 1 Cutout INPUT BROWN 1 1 1 10 1% Top view 5W or 10W Ceramic INPUT POSITIVE ADJUSTABLE REGULATOR RED 2 2 2 100 2% Pin 7 OUTPUT TO-220 PACKAGE ADJUST LM317. V is Voltage A + FUSES I is Current in Amps and A + LAMP R= V/I I R R is resistance in Ohms ZENER DIODES (1 WATT UNLESS SPECIFIED) z Zener Diode Part no.23. + Ver 1. Voltage 4. LM340.4 . LM340 C B (G) C (S) B B NPN Bottom view E C OUTPUT CAPACITORS E E (D) Symbol Component TO-3 TO-5 INPUT COMMON Non-Polarised NEGATIVE REGULATOR Ceramic MKT Greencap Electrolytic E TO-3 PACKAGE Non-Polarised 79XX. Voltage Part no. I= V/R V 1uF 1000nF .01uF 10nF . 474 Diode K . 100pF 101 The most basic law in electronics.04.com.2001 1N4739 9V1 1N4761 75V . 1N4729 3V6 1N4745 16V A + A + 1N4730 3V9 1N4746 18V 1N4731 4V3 1N4747 20V 1N4732 4V7 1N4748 22V BRIDGE RECTIFIER MICROPHONE 1N4733 5V1 1N4749 24V Symbol Component CRYSTAL 1N4734 5V6 1N4750 27V
[email protected] . LM350 = 4 . 0. 0.7nF 4700pF 472 If you know two out of the three values you can work out the third. The relationship between . 103 DIODE / ZENER DIODE 0. You will see the symbol Symbol Component IN Voltage OUT on the left and the component on the right. OUTPUT ADJUST (72) ADJUSTABLE REGULATOR Examples: (5 BAND) TO-3 PACKAGE yellow-purple-black-brown-brown LM317. .au 1N4735 6V2 30V 1N4751 1N4736 6V8 1N4752 33V AC COMPONENT REFERENCE CHART 1N4737 7V5 1N4753 36V 1N4738 8V2 1N4754 39V . LM350 ORANGE 3 3 3 1000 OUTPUT YELLOW 4 4 4 10000 VARIABLE RESISTORS Top view Pin 1 (to the left of cutout GREEN 5 5 5 100000 Symbol Component Symbol Component or mark on IC) OUTPUT NEGATIVE ADJUSTABLE REGULATOR INPUT TO-220 PACKAGE BLUE ADJUST LM337 6 6 6 1000000 Trimpot Potentiometer PURPLE TRANSISTORS INPUT 7 7 7 Symbol COMMON INPUT GREY 8 8 8 SILVER 5% Component POSITIVE REGULATOR TO-3 PACKAGE WHITE 9 9 9 GOLD 10% (FET) 78XX.7 .47uF 470nF . LM2940 INTEGRATED CIRCUIT (IC) Top view COMMON 3rd Digit Multiplier Tolerance OUTPUT NEGATIVE REGULATOR 1 Watt Symbol (example) Component INPUT TO-220 PACKAGE COMMON 79XX.7 . K .10% = 370K 10% C (A) B C E B EC POSITIVE REGULATOR Polarised + TO-126 TO-220(A) TO-92 PACKAGE TO-220 COMMON (3) 78LXX + Bottom view COMPONENT IDENTIFICATION SOT-30 CAPACITOR CODES + Electrolytic Tantalum Microfarads (u) Nanofarads (n) Picofarads (p) EIA code OHM’S LAW . + BATTERY 1N4740 10V 1N5349B 12V 5W A' 1N4741 11V 1N5352N 15V 5W 'A 1N4742 12V 1N5374 75V 5W AC 1N4743 13V .