| 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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