AES type of Battery Eliminator has hum in B+

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AES type of Battery Eliminator has hum in B+

RodB
Phorum Expert

Posts: 1,119
Threads: 44
Joined: Feb 2015
City: Roseville, MN

03-30-2025, 10:31 PM

So, I just built a 90 volt 40ma battery eliminator for a farm radio and had to use 1000 mfd for the input filter cap to keep the ripple to acceptable levels. It's just a pi filter, no pass transistor.

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Messages In This Thread

AES type of Battery Eliminator has hum in B+ - by Bruce B - 03-30-2025, 09:27 PM

RE: AES type of Battery Eliminator has hum in B+ - by morzh - 03-30-2025, 09:31 PM

RE: AES type of Battery Eliminator has hum in B+ - by Bruce B - 03-30-2025, 09:41 PM

RE: AES type of Battery Eliminator has hum in B+ - by morzh - 03-30-2025, 10:24 PM

RE: AES type of Battery Eliminator has hum in B+ - by RodB - 03-30-2025, 10:31 PM

RE: AES type of Battery Eliminator has hum in B+ - by morzh - 03-31-2025, 12:11 AM

RE: AES type of Battery Eliminator has hum in B+ - by Arran - 03-31-2025, 02:21 AM

RE: AES type of Battery Eliminator has hum in B+ - by Bruce B - 03-31-2025, 09:45 AM

RE: AES type of Battery Eliminator has hum in B+ - by RodB - 03-31-2025, 09:57 AM

RE: AES type of Battery Eliminator has hum in B+ - by morzh - 03-31-2025, 10:11 AM

RE: AES type of Battery Eliminator has hum in B+ - by RodB - 03-31-2025, 10:58 AM

RE: AES type of Battery Eliminator has hum in B+ - by David - 03-31-2025, 11:29 AM

RE: AES type of Battery Eliminator has hum in B+ - by David - 03-31-2025, 11:32 AM

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