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Hem Jung Hem Jung is offline
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Default clamping circuit help

On 3/15/21 1:19 PM, Peter W. wrote:
On Monday, March 15, 2021 at 12:38:27 PM UTC-4, Hem Jung wrote:
Been using a little square wave generator for experiments, has input
values from 3-29 VDC. However, at 24 VDC input, it burned out. I have
a replacement on the way, but vender suggested using a clamping circuit
to limit voltage to 25 VDC if my power supply is prone to spikes and I
suspect it is. Can someone suggest a suitable circuit with component
values needed? Thank you.


24V Zener diode to system ground? The shipping will cost more than the device! I am not sure if you mean an actual 'clamping circuit' as much as a voltage limiter. There is no AC that you are trying to limit, just the DC input maximum voltage.

Peter Wieck
Melrose Park, PA


Well, it's a cheap, Chinese 24 VDC switching supply so just trying to
avoid spiking at start-up. Is it as simple as a 24 V zener across the
input (+ to -)? If so, I have a few of those here.