Maybe a capacitor across the wiper contact will solve it. The capacitor would normally be shorted by the wiper making correct contact. A momentary opening would be swamped by the uncharged capacitor. The capacitor may need a small series resistance to reduce the current from the capacitor when the wiper shorts it again. [ I hope - I can't picture the wiper etc that you mention. Want to hear from others too.] John K. ----- Original Message ----- From: bob harper To: [email protected] Sent: Friday, March 28, 2014 2:01 AM Subject: Re: [neonixie-l] Re: trigger tube equivilents
Hi right I have broken the circuit to the solenoid from the cathode of the gr44 all other wiring reconnected as schematic it does indeed fire the gr44 and the solenoid if momentary disconnected so that does seem to be the source of the fault. Bob On 27 Mar 2014 09:33, "JohnK" <[email protected]> wrote: Depends on how and where you disconnected the trigger - may need to load down that pin. Can you confirm that lifting the wiper DOES trigger the tube? You could set up the right conditions on the other pins [including trigger] and then interrupt that circuit manually. If it is a 'glitch' from the wiper, a capacitor/resistor network should improve things. Let's see what is forthcoming from all the others here. John K Australia ----- Original Message ----- From: bob harper To: [email protected] Sent: Thursday, March 27, 2014 6:34 PM Subject: [neonixie-l] Re: trigger tube equivilents hi all...well i have finally got this thing working...all trigger tubes, in the selection system the countdown tubes in the credit unit and the 3 digital display nixie tubes...but ONE remaining problem. the 1st tube on the left in the schematic a GR44 [i have tried another as well] fires when it should, but also when it should not, i disconnected the trigger and it still fires...the problem [i think] is that the K cathode is connected via a wiper contact on a rotating arm to the reset solenoid, which although cleaned and adjusted and tested with the meter, must be occasionally losing its contact [bear in mind the etched track is 50 years old] for a split second.......clip..... -- You received this message because you are subscribed to a topic in the Google Groups "neonixie-l" group. To unsubscribe from this topic, visit https://groups.google.com/d/topic/neonixie-l/DfIGLpwsuMk/unsubscribe. To unsubscribe from this group and all its topics, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/A7552ABCC17545249339C8D11AEDCD0B%40compunet4f9da9. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CAM9UkxKAytBLmPOSR7hb4W7BpuEAYn5SPqjkhbav%3D20P3spKvw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/DCFA44E0BBE54F34B73A014C66D48D9B%40compunet4f9da9. For more options, visit https://groups.google.com/d/optout.
