I have simulate the scematic.
You need a resistor between NE555 out and Gate Q1. I think 150 Ohm is
good. The peek current is verry high, about the input capacity of the
gate from the mosfet.
Jens
Am 14.05.2013 02:38, schrieb threeneurons:
Is there some hand wired perfboard circuitry involved ? If so, can you
provide a photo of both sides. Back in school (when dinosaurs roamed
the Earth), I noticed a lot of my fellow students, used thin wire for
everything. Power and ground should be heavier. Those switching
supplies generate a bunch of interferene. This makes "physically"
routing signals, especially power and ground, even more important.
Everybody should get a copy of Don Lancaster's TTL Cookbook, if just
for the construction guide lines. For actual circuit ideas, you can
get his CMOS Cookbook, too. Both are old books, form the 70's, but
many of the guidelines still apply.
On Monday, May 13, 2013 4:19:05 AM UTC-7, nix wrote:
Hello I just build my own Nixie clock with input from Arduinix.com
and a power supply from ledsale (Build a nixie power supply -
LEDsales
<http://www.google.ch/url?sa=t&rct=j&q=nixie%20power%20supply&source=web&cd=5&cad=rja&ved=0CEEQFjAE&url=http%3A%2F%2Fwww.ledsales.com.au%2Fkits%2Fnixie_supply.pdf&ei=-smQUbLsKvD24QSX9IDgDA&usg=AFQjCNEiqKM6Acf_mlaSDuBrhUqL2A5Uvw&sig2=Bi2PdGfH0ERKhqQkk5wFQA&bvm=bv.46340616,d.bGE>)
Attached find the circuit and the pcb from fritzing. The clock
works fine but when I adjust the high voltage with R36 the ds1307
module from Twig
http://shop.boxtec.ch/twig-ds1307-p-40355.html
<http://shop.boxtec.ch/twig-ds1307-p-40355.html> starts to flicker
because on the serial interface it shows strange numbers like
/165/:/165/:85. After a while it does not return the time over the
i2c interface at all. A restart of the nixie clock starts showing
the time again. With an oscilloscope I can see that after a
certain position on R36 the SDA puls disapear and it shows a flat
line. I think it is at high level. Not so shure how to read the
oscilloscope.
Any Idea why? I don't see a direct link from the high voltage
power supply to the 2 wire interface. (see attached circuit)
Kind regards
Sergio
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