From base to emitter, or base to collector. OC71 Mullard Germanium Transistor NOS Tested & Selected Weight: 0.010kg SKU: N/A 5.00 Sussex Surplus. Did dr drays mom die oc71 germanium transistor grosse pointe yacht. A small capacitor would make a faster transistor slow enough. Did dr drays mom die oc71 germanium transistor grosse pointe yacht club membership cost. I think the circuit posted above depends on the transistor being very slow, so you would want to use one of the audio transistors. ![]() ![]() So I'm quite confused as to whether there's a different way to measure this that might reveal the *actual& Hfe of the device, or if for some reasons, I received a dud. Go for the lowest cost PNP audio parts you can find. I don't know if this is the case with the OC71, but I gave it a shot and the meter was incapable of reading the leads any differently: the red dot lead was still identified as the collector, and the Hfe remained the same.far too low for a Rangemaster.Ĭan anybody clarify what the heck is going on here? I know Steve isn't doing this stuff anymore but this was purchased several years ago when he was, and he had a dependable, solid reputation for auditioning and sending out transistors with the proper gains. It was called Build Your Own Transistor Radio with a Plank of Wood. The easiest way to detect this fault is to tap each transistor with the handle of a small screwdriver with the set switched on. switch on the ASY31 switching transistor in series with the oscillator. I remember reading that some old Mullars could have the Collector and Emitter swapped, so that in one position it read one Hfe and in the other, a higher Hfe. The four OC71 transistors provide high gain for the electro-cardiograph signals. I measured it two more times and that was the Hfe (at room temperature of about 70 F). I thought maybe I had done something wrong but I checked and I didn't. These were mounted in a black-painted glass case. But when I tested it on my Peak Atlas meter.the Hfe was 19. English: OC71, an early germanium PNP bipolar junction transistor. ![]() I assumed this meant that the transistor was in the right gain range for a Rangemaster, that is, somewhere between 70-100Hfe. I discovered I had an old Rangemaster "kit" from SmallBear I forgot I had received several years ago, which included an auditioned OC71.
0 Comments
Leave a Reply. |