Is this schematic correct?

Hi there.

I tried to build this twice and in both cases I don't get any output. I used new components each time.

Is there a mistake in the circuit? The circuit is supposed to convert 5VDC to 500VDC.

Instead of 5 x 100V zener I used 2 x 200V and for D2 I used a HER208 as it was just for testing.

Thanks in advance!

 

Hi Alec.

Thanks for your reply. Unfortunately I do not have an oscilloscope. I use the exact same transformer. I will measure the voltage as soon as I get home.

 

Hi Duke.

Thank you for your reply. I do have an inductance meter and will measure the coil. I'm not sure if C4 might influence the reading but I could cut one leg off and solder it back after the reading. I did connect the two upper coils together.

 

Hi Alec.

I'm sorry for having missed your 3rd question. No, I have not yet tried to reverse the connection on the coil going to the transistor. I will try that to tonight.

 

Hi there.

I just measured the voltage on T1 and measured 4.827 between vcc and base and 4.634 between vcc and collector. I disconnected C4 and attempted to measure the inductance between pin 1 & 4 with the the 2 coils connected but was unable to get a reading, I tried 2 different inductance meters. I have yet to try to reverse the connection between the third coil leading to the transistors.

 

Hi Alec.

Between ground and base I only measure 0,09 and nothing between ground and collector...

Which value for R1 would you suggest me to try? I do have a hertz function on my meter but I guess an oscilloscope would be better.

Is there also a paid service on the forum where I for example could offer to pay someone with more knowledge and equipment to build this for me for let's say 50 USD + materials?

 

The resistance between T1 collector and ground is 15.61 MΩ. Between collector and vcc the resistance is increasing as long as I measure and was exceeding 40MΩ

I found the circuit on https://radgoes.blogspot.se/2011/04/hv-inverter-circuit-for-geiger-mueller.html?m=1

 

Thanks Duke and Steve.

I desoldered the transformer and did an inductance reading and found out that the coils were not connected as I expected.

I expected one coil between pin 1 & 2, 3 & 4 and 5 & 6.

It turns out to be 1 & 6, 2 & 4 and 3 & 5.
1,978μH, 1,574μH, 1,733μH

I will do it on a breadboard this time

 

Hi you all.

Just some quick feedback. Unfortunately I don't have much time this week to build and test. I did do a quick breadboard configuration. I didn't got any output but I measured around 8VAC on the transformer so I guess it's just a bad connection somewhere. I will have to find some more time during next week. I will probably do it on a veroboard again (I have 6 transformers and enough other components)

I will keep you posted.