These are scans of the specifications for most of the Motorola HEP line of replacement transistors. Germanium and Silicon. Pages 10, 11, 12.
Archive for the ‘Field Effect Transistors FETS’ Category:
2016-10-18 FM Transmitter Uses Power MOSFET
I watched this YouTube video where the author shows his FM transmitter using a big 60 volt power MOSFET. He also shows a very readable photo of the schematic. The video was made several years ago in 2012. He is powering this transmitter by connecting it to eleven 9 volt batteries in series, totalling 99
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2016-10-03 Ordered Thru Hole Transistors
I went online a few days ago and looked for some odd RF transistors, but instead I was shocked. Almost all of the parts I’ve been using are through hole parts, like transistors in a TO-92 package with wire leads. I looked at a few distributors such as Mouser, Avnet, Arrow, Digikey, Newark. I found
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2016-06-04 Crystal Radio Coils, Crystal Diodes
I was reading some of Geo John’s projects and came across a crystal radio set that he built using two tuned coils. A crystal radio set refers to the type of detector used, which was once a galena crystal and a ‘catwhisker’ to find a sensitive spot on the crystal. Nowadays, that is no longer
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2015-12-16 JFET Joule Thief
I captured this off a video and tried to make it a bit more readable. I think it was from Sanjev. I built it and it does work at 40 millivolts. The 2SK170 JFETs are not common, and may be difficult to obtain. Other JFETs can be used, but I haven’t tried them. I wrote
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2013-08-04 A Low Voltage JT Using 2SK170 JFET
Fellow JT experimenter Quantsuff has been experimenting with a Joule Thief using the 2SK170 JFET, and it runs at 131 millivolts (0.131V), powered by a solar PV cell lit by a table lamp. This is a very good JFET for low voltages; I made a similar circuit a while back and it ran at several
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2013-08-02 Joule Thief, MOSFET Test
I built a Joule Thief using a 2N7000 MOSFET with the white LED across it, a standard coil (see below) and a voltage divider connected to the gate. I was trying to find out more about the MOSFET, such as the gate bias voltage needed to make it run on a 1.5V AA cell. The
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2013-07-02 Phase Shift Oscillator, JFET Continued
I blogged a schematic on May 15, but it took me until now to build the schematic. I tack soldered the PSO together with the components shown, except I did not use the two diodes and two 10k resistors. First off, according to this article, to get it to oscillate, the overall voltage gain of
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2012-12-17 IRF9Z34 Not The Same As IRLZ34
I ordered some IRLZ34 MOSFETs from Futurlec and they finally arrived, shipped from Hong Kong. I took one out of the bag and it was marked IRFZ34. What!?!? I ordered IRLZ34, not IRFZ34!! I took the rest out of the bag and I counted 33 of the IRFZ34, and 2 of IRF9Z34, which are not
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2012-11-27 Says TN0702 “Not Good Enough”
The Youtuber going by the name of Sanjev21 has read my comment about using the TN0702 low gate threshold MOSFET for a Joule Thief that will start and run below 0.6V. He replied that this has a Rds(on)of 4 ohms at 2 volts, which is “too high”. The problem is that he is using a
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