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I have changed the faulty components 8AV and 8v2 Zener and no other components found to be faulty.

Few detail for your analysis. Collector to Emitter voltage is v. Base to Emitter voltage is 8. The voltage at C4 is 0. I am worried why the vatasheet is not switching although it has a base voltage of 8v.

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There is no feedback voltage and secondary output. I have uploaded a similar circuit. Kindly help me to get this circuit working. Maybe you need a new transistor. First you need to change C4.

Check also for a bad solder joint on the emitter to R4 connection path. I have even changed the transistor and i don’t see the transistor is open or short. The new transistor also doesn’t switch.

I have replaced C4 which didn’t help. Also R10 is good and I am able to glow a 60W bulb from collector and emitter of transistor. A small test i have conducted is I get the instant output when i manual switch the transformer by keeping the bulb between collector and emitter.

Last edited by jayaramc; 1st July at My guess is that the 8V at B-E is not a DC voltage but an alternating signal that is confusing your meter. It’s better to share your questions and answers on Edaboard so we can all benefit from each others experiences. I am confused, whether the transistor needs more base voltage Dafasheet did you check for any short-circuit in the secondary section? You may try and change the D1 diode, C1 kyc.


I am sure the problem is in primary side and i don’t see any bad solder joints. The transistor is not switching even in 8v means, does it needs more voltage. I can see the max voltage is 9v for this transistor. Also is it normal that the voltage across the signalling diode Z1 as 0. I get 8v at base. My concern is 10301 8v is enough to switch this transistor and Z1 voltage of 0. Now I have tried removing Z2 and Base gets 11v. Datasheet analysis from you experts will be helpful.

Try to modify R7 ratasheet to K, this time using a good transistor the light bulb must be turned on Before I tried R9 with 10 ohms also I will check reducing R7 value whether it helps Also Fatasheet have tried removing Z2 and Base gets 11v.

I tried adding K in parallel across R7 with no effect. With all these actions tried already I am not sure what else remains: A DVM will not tell you the truth when measuring in the presence of an AC component and this circuit is a single transistor oscillator so the signal will not be pure DC. If you really have more than 1. Regarding the transdormer being faulty – it’s rare for them to fail but shorted turns in dztasheet winding will prevent the circuit oscillating whilst not significantly changing DC conditions.


Does this make any difference here. I am sure on the pins and checked as well I got only this from the shop when I asked for S. Battery Charger using LM 0. Battery charger using pic using pwm Part and Inventory Search.

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