UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post

Mike. Watterson · 29th Apr 2019, 9:11 am

Forward volts only reduces AM sensitivity. However power diodes are really slow, the 1N4007 are REALLY slow, so much that you can use them as PIN diode replacements.

Buy a 100x 1N4148 and 50x 1N60 (there are modern ones and they are best for AM sensitivity in a crystal radio, beating any Schottky signal diode).

Even the 1N4148 is fine in a superhet detector, but the 1N60 good for RF sniffer peak detectors etc.

I buy 1N4007 rather than any other 1N400x as they are slower and thus don't need snubbers. No good for higher voltage SMPSU, you need Ultra Fast types. The actual Schottky power diodes mostly are under 20V rating, I use 1N5819. Schottky signal diodes are more application specific and expensive, so I design for 1N4148 or 1N60 and only use them for replacements.

29th Apr 2019, 9:11 am	#157
Mike. Watterson Heptode Join Date: Dec 2014 Location: Limerick, Ireland. Posts: 901	Re: Ferguson 382U Firefly not playing ball Forward volts only reduces AM sensitivity. However power diodes are really slow, the 1N4007 are REALLY slow, so much that you can use them as PIN diode replacements. Buy a 100x 1N4148 and 50x 1N60 (there are modern ones and they are best for AM sensitivity in a crystal radio, beating any Schottky signal diode). Even the 1N4148 is fine in a superhet detector, but the 1N60 good for RF sniffer peak detectors etc. I buy 1N4007 rather than any other 1N400x as they are slower and thus don't need snubbers. No good for higher voltage SMPSU, you need Ultra Fast types. The actual Schottky power diodes mostly are under 20V rating, I use 1N5819. Schottky signal diodes are more application specific and expensive, so I design for 1N4148 or 1N60 and only use them for replacements.