Check te voltage divider at the outpup. Are resistors properly placed?
Dnia 2012-07-29 19:41 Huggermugger napisał(a):
Wot 'bout the coil? Is it suitable for the application?
Magnus
----- Original Message -----
From:Matzenegger
To:[email protected]
Cc:[email protected]
Sent: Sunday, July 29, 2012 3:38 PM
Subject: [neonixie-l] Re: 555 power supply not working
Hi all!
I'm new here to, didn't know if it was best to create a new
thread or
relive an old one.
I'm trying to build this same 555 power supply from the
ledsales schematic
http://www.ledsales.com.au/kits/nixie_supply.pdf .
I don't have ready access to a scope (thinking about buying
that cheap
DS0201, but it'll take 2 months to arrive and I'd like to have my nixies
fired up before that), but I'd like to see if you could help me troubleshoot
my circuit.
I built a test circuit for my 555 and it flashes the leds as
expected. Did
a brief test with the IRF740 and BC547 and they seem fine too. I was using
the IN4004 and afetr reading this tread, changed to the UF4007. It didn't
change the output. I simulated the circuit on ISIS, just to check. It
worked...
With 9.4V input I'm getting between 0.142V and 0.200V (changing
diodes)
where I should get 170V. I reduced my input all the way to 3.4V and got 3.2V
output.
Now talking about the things that looked weird to me with 9.4V
input:
- I measured the voltage before the diode and it gave me -0.21V
from
ground.
- Changing my trimpot does no effect whatsoever (but I tested
it).
- Replacing IN4004 with UF4007 didn't change the output.
- The MOSFET is NOT overheating. (it was in another
configuration that I
corrected).
Anybody has any thoughts?
Thanks,
Sam
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