strange feedback

From: bryan (bryan_at_accu-feed.com)
Date: 07/27/04 

Date: 27 Jul 2004 11:23:24 -0700

I have a counter that shuts off a relay . Whenever I send 110vac
through the relay the counter malfunctions. There are 2 transistors
and 2 schmitt triggers between the counter and the relay. I have a
diode across the coil of the relay so I don't understand why it does
this. If there is no 110vac going through the relay the counter works
perfectly.Why does the 110 affect the counter and how do I fix it?

Relevant Pages

  • Re: doubling up on a coil transistor?
    ... those transistors of the coil's inrush current and less soldering ... to add snubbers to the relay contacts. ... transistor will have a slightly lower base-emitter voltage, ...
    (rec.games.pinball)
  • Re: inrush current
    ... resistor so it acts as a Schmidt trigger and avoids relay chatter. ... transistor completes the line up of only 3 transistors, ... I have a circuit in use which is sensitive to relay chatter, ...
    (sci.electronics.repair)
  • Re: The KenSmith Jinx
    ... >>transistors will be clamping the HV until the relay opens. ... > series impedance in the path that can take the 600V difference and ... Ken, you can "open" a relay in a very short time, tens of microseconds ... The trick is to have the relay coil rated at 500V (rating, ...
    (sci.electronics.design)
  • Re: The KenSmith Jinx
    ... Energize the relay when you turn on your ... and through another series diode and resistor to the base of a PNP ... Connect the emitters of the transistors together and to ... Connect the collector of the NPN to V+ and the ...
    (sci.electronics.design)
  • Re: Powering a relay
    ... It had digital I/O. ... >A transistor solution shown below. ... The NPN are general purpose transistors ... this is when the relay should be turned on. ...
    (sci.electronics.basics)