Building a teeny Lm1875 chip amp, a Years Long shelved project , which I'm finally completing,
because I'm tired of having it as an unfinished adventure.
Have the usual Antek Tx . 15-0-15 (wanting + - 20v) .
Problem being I have One bridge on hand (and avoiding driving across town to buy a second one)
How do I wire the two secondaries together to only use One bridge.
Connect the two Green wires together as the - out put... OR ?
Thanks
because I'm tired of having it as an unfinished adventure.
Have the usual Antek Tx . 15-0-15 (wanting + - 20v) .
Problem being I have One bridge on hand (and avoiding driving across town to buy a second one)
How do I wire the two secondaries together to only use One bridge.
Connect the two Green wires together as the - out put... OR ?
Thanks
Use your DVM to pair the blue/green leads for each secondary. Be careful not to mix them up.
Then series connect the two secondaries so the outside wires add to 30VAC when measured with your DVM.
The junction is the center tap. The wrong connection will give nearly 0VAC between the outside wires.
Connect like this, which will indeed give you +20VDC and -20VDC with the center tap grounded.
Then series connect the two secondaries so the outside wires add to 30VAC when measured with your DVM.
The junction is the center tap. The wrong connection will give nearly 0VAC between the outside wires.
Connect like this, which will indeed give you +20VDC and -20VDC with the center tap grounded.
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Great !! Very much appreciated information . That saves me an annoying drive.
While here: Any point in doing the bleeder resistors across the 2 4700uF filter caps ? (it's a tiny amp,. Biggest thing in it is the Tx ).
While here: Any point in doing the bleeder resistors across the 2 4700uF filter caps ? (it's a tiny amp,. Biggest thing in it is the Tx ).
Yes, unfortunately transformer mfrs do not think it necessary to distinguish the two secondaries
by using different color wires. The user must determine which leads constitute a pair, and also
which relative phasing of the two windings is needed for proper operation with a rectifier.
by using different color wires. The user must determine which leads constitute a pair, and also
which relative phasing of the two windings is needed for proper operation with a rectifier.
Thanks people... Hmmm as this is my third Antek.
Can I reasonably assume that this little one is wired 'same' as my other two copies ?
Metered as same.. But also only at the learner stage of using my dvm .
Can I reasonably assume that this little one is wired 'same' as my other two copies ?
Metered as same.. But also only at the learner stage of using my dvm .