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Electronics Repair (sci.electronics.repair) Discussion of repairing electronic equipment. Topics include requests for assistance, where to obtain servicing information and parts, techniques for diagnosis and repair, and annecdotes about success, failures and problems. |
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#1
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trouble getting this circuit to work
Came across this circuit to be used as a dual coil ignition coil driver
recently and tried building it. However, despite all efforts, I can't get it to work: http://www.capturedlightning.org/hot...dracDriver.pdf If you read the description, you'll see that the included line voltage doubler is required if the circuit is to be operated from 120 v line. Therefore, I am using the doubler also. Here's all I can get from the circuit. I use between a 25 and 60 watt incandescent in series with the 120 v input to the doubler for protection of the circuit. When I plug in the circuit, I hear no sparks nor is there any hum of the included ignition coil. Sometimes the 60 watt bulb will light brightly as the circuit is plugged in; othertimes the bulb does not light at all. Adjusting the variable resistor has no effect on the brightness of the light bulb if it's on and if no light bulb, pot adjustment won't light it either. I've been told that the top and middle leads of QD1 need switched (in other words QD1 top goes to ground and QD1 middle goes to R2/diode junction). Tried that and still no response. This seems like it should be a simple circuit to troubleshoot, but I am out of practice for some time and not sure where to start. I've checked L1 out of circuit and it still has the proper resistance. I've also replaced the pot since adjusting it was getting me nothing, and still nothing with a new pot. The output from the doubler is correct at 300+ volts. Tried switching ignition primary wires, but still no effect. Instinct tells me that QD1 might be bad. Is there any way I can measure it out of circuit to be sure? What would resistances be between terminals? Any suggestions would be greatly appreciated. Thanks, John |
#2
Posted to sci.electronics.repair
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trouble getting this circuit to work
Assuming this is a "legitimate" circuit that /should/ work, all I can offer
is the obvious... Check that all the parts are "good". Have someone else go over your wiring. It's so easy to make a mistake, even in such a simple circuit. |
#3
Posted to sci.electronics.repair
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trouble getting this circuit to work
John Grafton wrote:
Came across this circuit to be used as a dual coil ignition coil driver recently and tried building it. However, despite all efforts, I can't get it to work: http://www.capturedlightning.org/hot...dracDriver.pdf If you read the description, you'll see that the included line voltage doubler is required if the circuit is to be operated from 120 v line. Therefore, I am using the doubler also. Here's all I can get from the circuit. I use between a 25 and 60 watt incandescent in series with the 120 v input to the doubler for protection of the circuit. When I plug in the circuit, I hear no sparks nor is there any hum of the included ignition coil. Sometimes the 60 watt bulb will light brightly as the circuit is plugged in; othertimes the bulb does not light at all. Adjusting the variable resistor has no effect on the brightness of the light bulb if it's on and if no light bulb, pot adjustment won't light it either. I've been told that the top and middle leads of QD1 need switched (in other words QD1 top goes to ground and QD1 middle goes to R2/diode junction). Tried that and still no response. This seems like it should be a simple circuit to troubleshoot, but I am out of practice for some time and not sure where to start. I've checked L1 out of circuit and it still has the proper resistance. I've also replaced the pot since adjusting it was getting me nothing, and still nothing with a new pot. The output from the doubler is correct at 300+ volts. Tried switching ignition primary wires, but still no effect. Instinct tells me that QD1 might be bad. Is there any way I can measure it out of circuit to be sure? What would resistances be between terminals? Any suggestions would be greatly appreciated. Thanks, John You do realize, using a voltage doubler like that, the low side must be floating on the circuit? or at least away from the mains. In other words, you can not have your (-) of that circuit to the common of the supply. Putting that aside.. It's possible your light bulb load is not allowing the cap to charge long enough before the trigger circuit fires. http://webpages.charter.net/jamie_5" |
#4
Posted to sci.electronics.repair
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trouble getting this circuit to work
Jamie t writes:
John Grafton wrote: Came across this circuit to be used as a dual coil ignition coil driver recently and tried building it. However, despite all efforts, I can't get it to work: http://www.capturedlightning.org/hot...dracDriver.pdf If you read the description, you'll see that the included line voltage doubler is required if the circuit is to be operated from 120 v line. Therefore, I am using the doubler also. Here's all I can get from the circuit. I use between a 25 and 60 watt incandescent in series with the 120 v input to the doubler for protection of the circuit. When I plug in the circuit, I hear no sparks nor is there any hum of the included ignition coil. Sometimes the 60 watt bulb will light brightly as the circuit is plugged in; othertimes the bulb does not light at all. Adjusting the variable resistor has no effect on the brightness of the light bulb if it's on and if no light bulb, pot adjustment won't light it either. I've been told that the top and middle leads of QD1 need switched (in other words QD1 top goes to ground and QD1 middle goes to R2/diode junction). Tried that and still no response. This seems like it should be a simple circuit to troubleshoot, but I am out of practice for some time and not sure where to start. I've checked L1 out of circuit and it still has the proper resistance. I've also replaced the pot since adjusting it was getting me nothing, and still nothing with a new pot. The output from the doubler is correct at 300+ volts. Tried switching ignition primary wires, but still no effect. Instinct tells me that QD1 might be bad. Is there any way I can measure it out of circuit to be sure? What would resistances be between terminals? Any suggestions would be greatly appreciated. Thanks, John You do realize, using a voltage doubler like that, the low side must be floating on the circuit? or at least away from the mains. In other words, you can not have your (-) of that circuit to the common of the supply. Putting that aside.. It's possible your light bulb load is not allowing the cap to charge long enough before the trigger circuit fires. http://webpages.charter.net/jamie_5" If he's measuring a constant 300 V on the HV input, then that's not the problem. You really need an oscilloscope to see what's happening at the junction of R1 and C1 - it should be sawtooth as C1 charges and eventually triggers QD1. You can also AC-couple your DMM if it doesn't already have a blocking capacitor on the AC range and see if there's any activity there. -- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
#5
Posted to sci.electronics.repair
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trouble getting this circuit to work
On Jan 4, 4:05*am, "John Grafton" wrote:
Came across this circuit to be used as a dual coil ignition coil driver recently and tried building it. *However, despite all efforts, I can't get it to work: *http://www.capturedlightning.org/hot.../Old2001Files/ 2001-... If you read the description, you'll see that the included line voltage doubler is required if the circuit is to be operated from 120 v line. Therefore, I am using the doubler also. Here's all I can get from the circuit. *I use between a 25 and 60 watt incandescent in series with the 120 v input to the doubler for protection of the circuit. *When I plug in the circuit, I hear no sparks nor is there any hum of the included ignition coil. *Sometimes the 60 watt bulb will light brightly as the circuit is plugged in; othertimes the bulb does not light at all. *Adjusting the variable resistor has no effect on the brightness of the light bulb if it's on and if no light bulb, pot adjustment won't light it either. *I've been told that the top and middle leads of QD1 need switched (in other words QD1 top goes to ground and QD1 middle goes to R2/ diode junction). *Tried that and still no response. This seems like it should be a simple circuit to troubleshoot, but I am out of practice for some time and not sure where to start. *I've checked L1 out of circuit and it still has the proper resistance. *I've also replaced the pot since adjusting it was getting me nothing, and still nothing with a new pot. *The output from the doubler is correct at 300+ volts. *Tried switching ignition primary wires, but still no effect. *Instinct tells me that QD1 might be bad. *Is there any way I can measure it out of circuit to be sure? What would resistances be between terminals? Any suggestions would be greatly appreciated. Thanks, John If you use a 'scope as Sam Goldwasser suggested (excellent advice) GET AN ISOLATION TRANSFORMER !!! G² |
#6
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trouble getting this circuit to work
I got it to work. Bad quadrac and improper schematic. However, I do have
another question. This circuit is made to be able to run two ignition coils in parallel for maximum output. I have the two GM HEI coils that it calls for, but they are slightly different and I am unsure how to parallel the HV side. Better shown than explained: http://img212.imageshack.us/img212/4968/heicoil1ip2.jpg Any thoughts would be appreciated. Thanks, John "Samuel M. Goldwasser" wrote in message ... Jamie t writes: John Grafton wrote: Came across this circuit to be used as a dual coil ignition coil driver recently and tried building it. However, despite all efforts, I can't get it to work: http://www.capturedlightning.org/hot...dracDriver.pdf If you read the description, you'll see that the included line voltage doubler is required if the circuit is to be operated from 120 v line. Therefore, I am using the doubler also. Here's all I can get from the circuit. I use between a 25 and 60 watt incandescent in series with the 120 v input to the doubler for protection of the circuit. When I plug in the circuit, I hear no sparks nor is there any hum of the included ignition coil. Sometimes the 60 watt bulb will light brightly as the circuit is plugged in; othertimes the bulb does not light at all. Adjusting the variable resistor has no effect on the brightness of the light bulb if it's on and if no light bulb, pot adjustment won't light it either. I've been told that the top and middle leads of QD1 need switched (in other words QD1 top goes to ground and QD1 middle goes to R2/diode junction). Tried that and still no response. This seems like it should be a simple circuit to troubleshoot, but I am out of practice for some time and not sure where to start. I've checked L1 out of circuit and it still has the proper resistance. I've also replaced the pot since adjusting it was getting me nothing, and still nothing with a new pot. The output from the doubler is correct at 300+ volts. Tried switching ignition primary wires, but still no effect. Instinct tells me that QD1 might be bad. Is there any way I can measure it out of circuit to be sure? What would resistances be between terminals? Any suggestions would be greatly appreciated. Thanks, John You do realize, using a voltage doubler like that, the low side must be floating on the circuit? or at least away from the mains. In other words, you can not have your (-) of that circuit to the common of the supply. Putting that aside.. It's possible your light bulb load is not allowing the cap to charge long enough before the trigger circuit fires. http://webpages.charter.net/jamie_5" If he's measuring a constant 300 V on the HV input, then that's not the problem. You really need an oscilloscope to see what's happening at the junction of R1 and C1 - it should be sawtooth as C1 charges and eventually triggers QD1. You can also AC-couple your DMM if it doesn't already have a blocking capacitor on the AC range and see if there's any activity there. -- sam | Sci.Electronics.Repair FAQ: http://www.repairfaq.org/ Repair | Main Table of Contents: http://www.repairfaq.org/REPAIR/ +Lasers | Sam's Laser FAQ: http://www.repairfaq.org/sam/lasersam.htm | Mirror Sites: http://www.repairfaq.org/REPAIR/F_mirror.html Important: Anything sent to the email address in the message header above is ignored unless my full name AND either lasers or electronics is included in the subject line. Or, you can contact me via the Feedback Form in the FAQs. |
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