Two easy to build amplifier circuits, i.e., a NPN transistor common base configuration and a JFET common gate configuration. I used both to improve the receiver performance (sensitivity) on the Zenith 6S229 using a 10' horizontal wire antenna in the shop. Both designs have a low input impedance and a medium to high output impedance.
Keep in mind, all signals are increased including NOISE. The voltage gain measurements are approximate (at 1.0 MHz) based on a 50 ohm input source w/ the input level low enough to not introduce clipping of the sinewave.
References:
#The Offset Volt
31. Common Base Amplifiers by https://youtu.be/oci80Csr1zk
https://worldradiohistory.com/
Electronics Now
November, 1993
Transistor Cookbook by Ray Marston
Common-Gate FET Amplifiers - The Engineering Knowledge
https://www.theengineeringknowledge.com/common-gate-fet-amplifiers/
The schematics & BOMs are in the folder NPN Common Base & JFET Common Gate Amplifier Circuits:
https://drive.google.com/drive/folders/1YWFz8oWHopVcscbIxR7JOYqRYrRYTjOE?usp=sharing
The playlist for the Zenith 6S229 series:
https://youtube.com/playlist?list=PLjLu4V-71S1L5tbdLdceoWWndwxgm5EH3
Thanks for watching and subscribing to my channel on vintage radio repair and other related circuits.
#restoreoldradios
#6S229
Keep in mind, all signals are increased including NOISE. The voltage gain measurements are approximate (at 1.0 MHz) based on a 50 ohm input source w/ the input level low enough to not introduce clipping of the sinewave.
References:
#The Offset Volt
31. Common Base Amplifiers by https://youtu.be/oci80Csr1zk
https://worldradiohistory.com/
Electronics Now
November, 1993
Transistor Cookbook by Ray Marston
Common-Gate FET Amplifiers - The Engineering Knowledge
https://www.theengineeringknowledge.com/common-gate-fet-amplifiers/
The schematics & BOMs are in the folder NPN Common Base & JFET Common Gate Amplifier Circuits:
https://drive.google.com/drive/folders/1YWFz8oWHopVcscbIxR7JOYqRYrRYTjOE?usp=sharing
The playlist for the Zenith 6S229 series:
https://youtube.com/playlist?list=PLjLu4V-71S1L5tbdLdceoWWndwxgm5EH3
Thanks for watching and subscribing to my channel on vintage radio repair and other related circuits.
#restoreoldradios
#6S229
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