On Feb 13, 10:58 pm, threeneurons <[email protected]> wrote: > Add these two parts: > > http://threeneurons.wordpress.com/nixie-power-supply/555_shtdwn/ > > It will drag the RESET low, indifferent to the output voltage, so the > FET is always off.
Oops ! I just took a closer look at the circuit. Q2 is tied to CTL (5), not RST (4), in this circuit. Most 555 circuits, I've seen, diddle the RST, and I just "assumed". You know what happens when you do that. Its out, so might as well try it out and see what happens. If the results aren't satisfactory, and/or something gets hot, then undo it. Break the +9V connection from RST, and reconnect it to +9V, thru a 10K resistor. Tie the collector of an added NPN (similar, or same as Q2, 2N2222, 2N3904, MPSA05 okay). Tie that NPN to gnd. Tie another 10K to its base, and the other side of that resistor goes to your Arduino IO bit. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To post to this group, send an email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/neonixie-l?hl=en-GB.
