A couple of days ago Mike said:-
"The 0A5 is used in
place of the neon bulb, but this tube generates a pulse so large, that
no amplification is needed. Actually, the pulse is too big. In this
circuit, its 400V, and peaks at 5 amps (for ~2uS). The pulse is
attenuated before kicking the guides of the dekatron. That pulse
destroyed 2 4.7 ohm resistors. The tube works on the 'arcing' mode of
gas discharge, and 5 amps is the minimum current for proper function.
The 4.7 ohm resistor limits the current, and stretches the pulse. Peak
power is over 100 watts, but only for a short 2uS. The original carbon
film resistor has been be replaced by a wirewound resistor."
John K.
----- Original Message -----
From: "John Rehwinkel" <[email protected]>
To: <[email protected]>
Sent: Sunday, December 18, 2011 1:34 AM
Subject: Re: [neonixie-l] Re: Spinner Driven by 0A5 Gas Trigger
The schematic, if you want to make your own:
http://threeneurons.files.wordpress.com/2011/09/0a5_spnr.gif
I like the way you've balanced the drive waveforms to G1 and G2 with
judicious resistor and capacitor choices.
What is the purpose of the (apparently optional) diode connected to the
index pin?
Why is R6 a 3W wirewound unit? As far as I can tell, it carries an
average current of less than 4mA (although the peak current is a few
amperes, which may have something to do with it).
- John
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