| Electronics > Beginners |
| recently obtained a germanium part |
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| emece67:
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| David Hess:
--- Quote from: Ian.M on June 09, 2019, 10:35:47 am ---There are very few things a Ge power transistor is good for nowadays, apart from repairing antique equipment. One application that may be worth experimenting with is an ultra-low voltage Joule Thief. Of course it wont start at as low a voltage as a modern energy harvesting IC . . . --- End quote --- They make great pass elements for very low dropout voltage regulators. And they are useful for a very low input voltage inverter which is even better than a Joule Thief. |
| Seekonk:
I still have a batch of GT-109 from General Instrument, 67 date code if I remember. Must be at the end of production because they finally got very good at it. Leakage compares to silicon. I have people that prize these because they make excellent FUZZ boxes. One guy said he has bought all sorts of germanium and never found any as good as mine. |
| exe:
I have a few (may be 10-20, not many) old USSR transistors. I want to build something with them, but can't figure what. Probably, I should just throw them or give away. |
| Macbeth:
--- Quote from: Gyro on June 09, 2019, 06:49:50 pm ---The last time I used a Germanium transistor, it was an OC71 style glass encased one - I used it as the sensor for a precise aquarium thermostat, higher temperature coefficient than Silicon and nice fish friendly package. It was glued into the end of a plastic tube with aquarium safe silicone. It was still going strong after 20+ years. --- End quote --- The OC71 is my most memorable transistor. Because as a child in the '70s I made the Ladybird Radio and wired the OC71 backwards and it released the magic smoke. That was my first hint at the brutality of getting things wrong in electronics. But the unpowered germanium diode crystal set went so well...! |
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