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Old 5th April 2006, 02:47 AM   #1
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Default crystal radio transistor amplifier

I've messed with tubes more than transistors. Was interested in seeing a good way to use modern silicon devices to amplify my crystal detector. Using an extremely crude setup of 2n3906 direct coupled to a 2N3055 driving a transistor radio 1/2W 8ohm speaker in a stuffed cardboard pipe. Sound is loud enough for tinkering but i'd like to clean it up. Suggestions for values of resistors/capacitors or a schematic to stabilize the bias, with perhaps a little feedback. Supply will be limited to 3 to 4 AA Batts.
Any ideas or websites? thanks
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Old 5th April 2006, 05:48 AM   #2
CBS240 is offline CBS240  United States
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4 AA's won't have much juice for very long....but how about TPA122 IC? Seems like it would work with your AA's...

http://focus.ti.com/lit/ds/symlink/tpa122.pdf

I think Mouser may have some of these as I'm sure does other distributers.
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Old 6th April 2006, 02:20 AM   #3
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Default crystal radio transistor amplifier

Naah that's too easy. I want to experiment with discreet devices, I have an LM386 and a 741 op amp somewhere. I would like to stay in the vein of the kind of stuff that was popular back in the '60's and learn some of the transistor theory through application. I found some books in the thrift store, I think I can figure something out. I also found good info at
http://techlib.com
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