Given that germanium point contact diodes are themselves a rarity these days we’re guessing that some of you will be wincing at that. There’s somebody on eBay selling 5 gram chunks of what’s ...

The point contact device is already described as superceded by the junction transistor, but as well as those two we are shown a phototransistor and a junction tetrode, a now-obsolete design that ...

Figure 2 shows the forward-transistor emitter current of the 2N3904 and the forward current of the 1N34 germanium point-contact diode. The logarithmic current scale shows the impressive response of ...