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Messages - markeprice

1
Project logs / Re: Nixie SMPS efficiency tested
I am using a nixie type power supply that uses a 555, IRF740 and BC547c.  I am having a terrible time getting anything other than the 12-15VDC at the input at the output of the high voltage (B+).  Basically if I have 12VDC going in, I have 12VDC at the output.  I have swapped out all the compenents listed earlier plus the 4.7uf cap.  No change.  Has anyone got any troubleshooting tips for me?  I have gone over a few different schematics that use the same or similar components and cross checked my pcb implementation (on a superfly amp board by Rick Holt, frequency central) and cannot see what might be the problem.  I am guessing since there is no difference between the input and output that there is no "charge pumping" going on.  I don't own a ocilliscope, just a multimeter.  Can you provide a recent tested and verified schematic of this type of supply.  Thank you.  Getting frustrated!  Mark

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