crystal radio transistor amplifier

Sparky OR · 5th April 2006, 01:47 AM

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

CBS240 · 5th April 2006, 04:48 AM

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.

Sparky OR · 6th April 2006, 01:20 AM

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

5th April 2006, 01:47 AM	#1
Sparky OR diyAudio Member Join Date: Jun 2003 Location: Eugene, Oregon	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 __________________ Wish I'd studied this stuff with as much interest 30 years ago!

5th April 2006, 04:48 AM	#2
CBS240 diyAudio Member Join Date: Aug 2005 Location: K-town	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. __________________ All the trouble I've ever been in started out as fun......

6th April 2006, 01:20 AM	#3
Sparky OR diyAudio Member Join Date: Jun 2003 Location: Eugene, Oregon	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 __________________ Wish I'd studied this stuff with as much interest 30 years ago!

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