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Is it feasible to press a surplus current transformer (toroid type) into acceptable service as a DC power choke for 100 & 120 HZ ripple? I calculated a needed L of about 1.8 to 2milliH of L. Any one had success doing something similar? Thanks, MikeHS

While nothing is totally noiseless... I do not see the application here as being overly burden by noise. I'm still favoring a 555 type or similar discrete part solution. I haven't looked at a Mims solution yet but hopefully it will work. There is no need to reinvent the wheel. I'll try to...

Hello again and thanks for replys... Let me add one comment to my intial posting, just as a clarification. only after 10 to 20 seconds of STEADY 12 to 24V input. Short bursts of +12 to 24VDC need to be ignored. ... New Part... Also, the total absence of the 12 to 24VDC input needs to be...

Thank you for the replys thus far. I am attempting to avoid any programming and prefer a KISS solution, if possible. Low parts count is part of the KISS solution, IMH0.02O. Regarding the 555s... sounds interesting. Any more ideas would be appreciated. Mike

Hello, Need to design or come up with a 10 to 20 second delay timer that auto-resets each time a +12 to 24VDC is applied. The timer source voltage (Vcc) can be a separate input, say +5V, or the same +12 to 24V. The one shot output needs to be a positive pulse to drive an SCR gate terminal...but...