400A's on/off flip flop flipping and flopping. - diyAudio
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Old 7th February 2016, 05:05 AM   #1
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Default 400A's on/off flip flop flipping and flopping.

Is there anyone left out there who can help me in troubleshooting one of the first Threshold 400A's??? I have one that's turning itself on and off repeatedly. According to a thread from Nelson Pass, this circuit uses an on/off flip flop made with an op amp that uses positive feedback. The on and off LED's blink back and forth on the front panel like a RR crossing gate switching the main power supply's Triac on and off ...


Frank DuVall
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Old 7th February 2016, 05:07 PM   #2
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400a's had a front panel switch.

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