Gefell UM 92.1s PSU DIY

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dinesh

Well-known member
Joined
Mar 28, 2006
Messages
195
Location
India
Hi,
My friend got gefell UM 92.1s mic without PSU.
Is it possible to modify U47 PSU to use with this mic? Do any one have the schematics & Pinout?

Thanks
Dinesh
 
The schematic you can find here:
http://www.tab-funkenwerk.com/id71.html
You can't use U47 PSU. Gyrafs PSU for GIC mike can be used with few small mods.
http://www.gyraf.dk/gy_pd/g7/gic_s.gif
 
A Chinese supply rewired for the correct pinout would work too. Just needs two circuit mods:

– Remove diode in position D11, and replace with bridge. If needed add a small dropping resistor, but shouldn't be a problem using mic with ~ 6V heater

– Replace zeners D5 and D6 with 2x 60V
 
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