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Recent content by ITPhoenix

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    How to design a toggle flip-flop with 555

    Go here: https://www.edaboard.com/threads/290742/
  2. I

    555 Toggle Starts High Sometimes

    555 Toggle Circuit - Final I do not know what you mean "buzzer for warning". I did find the culprits, though. This goes in a tube amp. First, I had to increase the reset delay timing cap to 10uF because it takes a long time for the system to stabilize. I monitored my tube voltages and...
  3. I

    555 Toggle Starts High Sometimes

    Stable 555 Toggle Circuit There were problems with a faulty pushbutton, timers of unkown quality and condition, and an unsoldered connection. After much testing, it appears the following always starts output low, and is stable. It is probably overkill, but there are many unkowns in my...
  4. I

    555 Toggle Starts High Sometimes

    Implementing the suggestion with a 7 sec. delay (verified), and retesting with PS storage caps discharged, here is the result: If the system is left in ouput low state, on restart, the output goes high a few seconds after the 7 sec. delay. If left in the output high state and restarted, the...
  5. I

    555 Toggle Starts High Sometimes

    Hello folks. The following circuit works perfectly, but sometimes the output will be high on power-up. The storage cap on the 6VDC supply has a drain resistor that totally discharges the cap within 30 seconds. The problem may appear after hours of power-down/discharge. A 10nF cap was added...

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