I'm a long time lurker but this is my first post.
I bought this DAC kit from a Chinese seller on eBay thinking that it would be a straightforward and economical way of getting a TDA1541 based DAC with NOS + tube output mod possibilities in the future.
The seller's description for power supply requirements is as follows: "Power needs 3 way 1 pair of dual 15 (can be up to 22V) 2 single 7V (up to 11V) the whole machine free debugging"
I think I figured out the 2 x 7V winding (green and yellow pair of twisted leads) connections as pictured. But I don't know how to configure the 2 x 15V windings (blue and white pairs) for connection to the 3-terminal connectors.
I've built tube preamps and amps but I'm a total newbie with solid state/digital so I'd appreciate assistance.
Thanks in advance!
JE
I bought this DAC kit from a Chinese seller on eBay thinking that it would be a straightforward and economical way of getting a TDA1541 based DAC with NOS + tube output mod possibilities in the future.
The seller's description for power supply requirements is as follows: "Power needs 3 way 1 pair of dual 15 (can be up to 22V) 2 single 7V (up to 11V) the whole machine free debugging"
An externally hosted image should be here but it was not working when we last tested it.
An externally hosted image should be here but it was not working when we last tested it.
I think I figured out the 2 x 7V winding (green and yellow pair of twisted leads) connections as pictured. But I don't know how to configure the 2 x 15V windings (blue and white pairs) for connection to the 3-terminal connectors.
I've built tube preamps and amps but I'm a total newbie with solid state/digital so I'd appreciate assistance.
Thanks in advance!
JE
First verify the pairs are correct with an ohm meter.
Connect blue from pair #1 to white from pair #2.
Use both of those wires for the center tap (ground).
Measure resistance on the Multimeter, one blue should have zero resistance with one of the whites. Those two are the center tap (GND) the other two are the + and - 15V
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Thanks for your replies @rayma + @GASCo.
Yes, I've verified via DVM that the pair of blue windings are not connected to the white pair.
I connected the windings in series with the CT connected to ground (center terminal) with the single blue and white on the outer terminals.
Did I get this right?
Thanks again!
JE
Yes, I've verified via DVM that the pair of blue windings are not connected to the white pair.
An externally hosted image should be here but it was not working when we last tested it.
I connected the windings in series with the CT connected to ground (center terminal) with the single blue and white on the outer terminals.
Did I get this right?
Thanks again!
JE
An externally hosted image should be here but it was not working when we last tested it.
What is this component? I presume it should be mounted in the area marked "L", since I've mounted everything on the PCB board except this. This is the first time I encountered it.
Maybe not, the mfr is user hostile. There is no way to tell
the correct phasing of the windings without a special test.
If one white and one blue are connected together to ground,
this may or may not work, there's a 50-50 chance.
The wrong connection will give close to zero voltage from end-to-end.
If this happens, reverse ONLY the two blue wires. Leave the two white
wires where they are. Then it should work.
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I see you what you mean. I'll keep that in mind when I test.
Thanks a lot for the tip!
JE
Hope you marked the wires!
I have a similar, horribly marked transformer, my center wires are now tied together in a knot.
I have a similar, horribly marked transformer, my center wires are now tied together in a knot.
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