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#1
November 25th 05, 12:26 PM
posted to rec.radio.amateur.homebrew
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Unusual functions of cheap parts
(not x-posted)
Besides the already mentioned reverse-polarized diodes as varicaps (http://www.hanssummers.com/radio/varicap/index.htm), I use 74HC240 as HF QRP finals (600mW) and IRF510 as HF PA (20-30W max, QST has some articles in the past). Paolo IK1ZYW |
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#2
November 25th 05, 12:32 PM
posted to rec.radio.amateur.homebrew
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Unusual functions of cheap parts
Besides the already mentioned reverse-polarized diodes as varicaps (http://www.hanssummers.com/radio/varicap/index.htm), I use 74HC240 as HF QRP finals (600mW) and IRF510 as HF PA (20-30W max, QST has some articles in the past). Paolo IK1ZYW TL-431 Shunt regulator as a low powered fixed gain 3 terminal audio amplifier. W4ZCB |
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#3
November 26th 05, 05:24 AM
posted to rec.radio.amateur.homebrew
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Unusual functions of cheap parts
A simple 1.0 K Ohm or so carbon film resistor placed across the line makes a very nice display after a couple of seconds. They also make a handy fuse to trigger a little firecracker when used as a "surprise" for some unsuspecting technician placed across his load behind the workbench when he turns it on in the morning. boB K7IQ |
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