Hi folks!
Is there any reason why I shouldn't use a 2 diode full wave rectifier for an unregulated bias supply? I never see schematics (new or old) in this configuration, so there has to be a reason NOT to do it. No? I've got an old 50-0-50 trannie that puts out about 100 mA...I figure it would give me 60V after smoothing.
Thank you,
John.
Is there any reason why I shouldn't use a 2 diode full wave rectifier for an unregulated bias supply? I never see schematics (new or old) in this configuration, so there has to be a reason NOT to do it. No? I've got an old 50-0-50 trannie that puts out about 100 mA...I figure it would give me 60V after smoothing.
Thank you,
John.
Mainly becasue for this conviguration you either need to halve the supply or have a center tapped winding, therefore this is very inefficient. As the bias supply doesnt need to supply much current not alot of smothing is needed. A bridge rectifier would be much better. You said 50-0-50, that could be 100 volts. 100ma is alot for a bias tap. anyway 100*.1 = 10VA 50*.1 = 5VA
You could use the transformer with a bridge to provide a 60-70V negative bias supply, and a 120-140V negative tail supply for an LTP.
The reason you are unlikely to see this is that it is expensive to have a special transformer for this purpose. Since you have it you might as well use it. Alternatively, use it to power a lowish voltage preamp.
The reason you are unlikely to see this is that it is expensive to have a special transformer for this purpose. Since you have it you might as well use it. Alternatively, use it to power a lowish voltage preamp.
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