- clamping circuit help - 2 Updates
| amdx <amdx@knology.net>: Mar 22 07:18AM -0500 On 3/15/2021 12:58 PM, Peter W. wrote: > Just that simple, yes. Not sure how much current goes into this device, but you want the diode to be rated at least 2x that current so it does not fail under load. > Peter Wieck > Melrose Park, PA So your point is, if he has a 1 amp 24V power supply, he needs a 2 amp 24V Zener Diode? Ya, I found one, it is a 1.980 amp 24 Volt Zener at Mouser. Better order it soon it has a 40 week lead time and the price is $802,40. > https://www.mouser.com/ProductDetail/Microchip-Technology/JANTX1N2820B?qs=CP1DtB0LfQcCGfenu8oJbg%3D%3D In this case, putting a Zener directly across the output of a power supply output is not the way to do this. As long as you don't require a precise 24 volts, find out what the current draw is of the square wave generator with your load. Calculate the resistance needed to drop 2 volts. Put the resistor in series with the Positive output and Zener from the resistor to ground. This way any voltage that is over 24 volts at the Zener will cause it to conduct and the over voltage will be dissipated in the resistor. You could also use a 20V Zener and calculate the proper resistor value so the Zener is actual Zenering all the time and regulating the voltage, rather than just limiting any over voltages. Adjust resistor value to not exceed Zener dissipation limits. Mikek -- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus |
| "Peter W." <peterwieck33@gmail.com>: Mar 22 07:30AM -0700 His goal is to limit the surge at power-up. A diode of the correct rating will do that just fine without a resistor. KISS Peter Wieck Melrose Park, PA |
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