Electronics > Beginners
1N34 Diode Schematic included
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Aztlanpz:
Schematic
rstofer:
Given that the 2 diodes just work as a half-wave rectifier to turn on the transistor when the crystal starts oscillating, I would think any small signal diodes would work.  Try 1N914 or 1N4148.
bson:
A 1V 1N4148 (they also come in 1.2V, but this may only be a difference in the current at which it's measured) -
https://www.mouser.com/ProductDetail/ON-Semiconductor-Fairchild/1N4148TR?qs=sGAEpiMZZMudZehw8RjeZQwvkgSNJ%252b%2f0

$2.20 for 100pc on tape.
bson:

--- Quote from: rstofer on October 30, 2018, 04:14:55 am ---How does the forward voltage drop of a germanium diode compare to a Schottky diode?

--- End quote ---
The 1N34 has a 1V forward drop and a 50µA reverse leakage, 1pF capacitance at 1MHz.  A 1N4148 has a 1V (or 1.2V depending on which angle you look at it), 5µA reverse leakage, and 4pF capacitance.  It's pretty much a straight drop-in replacement.  The germanium will tolerate higher surge currents, but the TH 1N4148 can tolerate 4A for 1 second, and I doubt this tester will ever come close to this, just looking at what else is in it (small signal BJTs etc).
johnkenyon:

--- Quote from: rstofer on October 31, 2018, 06:15:04 pm ---Given that the 2 diodes just work as a half-wave rectifier to turn on the transistor when the crystal starts oscillating, I would think any small signal diodes would work.  Try 1N914 or 1N4148.

--- End quote ---

Looks more like a half wave voltage doubler to me, but like you said, any small signal diode would do.
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