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Topic: Buffer amp (Read 446 times)
W7CXC
Member
Posts: 336
Buffer amp
«
on:
February 20, 2022, 03:35:12 PM »
Any schematics out there for a buffer amp to take the roughly 2 to 3 volt pp output of an 8640b up to say 20vpp so it can be used as a VFO for a crystal controlled boat anchor? Discrete components perhaps? Dave
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WB6BYU
Member
Posts: 20896
Re: Buffer amp
«
Reply #1 on:
February 20, 2022, 03:46:05 PM »
Bipolar?
FET?
GlowFET?
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www.PracticalAntennas.com
W7CXC
Member
Posts: 336
Re: Buffer amp
«
Reply #2 on:
February 20, 2022, 03:48:31 PM »
HiHi... not glow FET that gets complicated.
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KE0ZU
Member
Posts: 581
Re: Buffer amp
«
Reply #3 on:
March 02, 2022, 05:53:18 AM »
Why not just a simple transformer? No increased "power" requirements involved.
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Regards, Mike
https://mikeharrison.smugmug.com/
Pics and bold print are usually links.
W1VT
Member
Posts: 6071
Re: Buffer amp
«
Reply #4 on:
March 02, 2022, 06:09:51 AM »
There are designs for efhw transformers with a 7:1 winding ratio that may meet your needs.
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KH6AQ
Member
Posts: 9292
Re: Buffer amp
«
Reply #5 on:
March 03, 2022, 07:18:25 AM »
I think that KE0ZU has the simple solution. A 1:9 unun will transform HP8640the 4V P-P (into 50 ohms) output to 12V P-P into 450 ohms and a higher swing into a higher impedance. There are a few commercial designs or you can roll your own.
9:1 unun
https://www.balundesigns.com/model-9130sw-qrp-9-1-unun-1-5-54-mhz-300-watts/
HP8640B
https://www.valuetronics.com/product/8640b-agilent-rf-generator-used
If you'd prefer an active design I'll design you one, transistor or vacuum tube.
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