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Please help with power supply
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samson:
Hi, Could someone please advice were is the centre tap for this transformer. I need to tap 11v ac.
Any help is appreciated.
coromonadalix:
you have 3 secondaries, one with a center tap who go on d208,  but no where you get an 11vac ?? out of it

you already have 11vac form one secondarie,   find it with an dmm ??   d201 d202 d203 d204 ??


easy ?

its between the yellow orange or the green,   follow wich ones go the the 4x diode group d201 d202 d203 d204
Kean:
It is kind of annoying that they numbers the transformer primary terminals on the schematic symbol, but not the secondary terminals.

I think it is a fair assumption that the secondary terminals are in the same order as the schematic, and if so seeing the two wires that head off away from the PCB on terminals 11 & 13 make me believe those are the ones labelled "heater" on the schematic.

That then leads to terminal 7 & 8 (orange & yellow) being the 11V AC winding, and terminals 9 & 10 (green and blue) being the 15V AC winding.

This matches up with the PCB layout, with orange and yellow terminating near D201-204 as on the schematic, and green and blue near D205/207.  Purple wire being the heater centre tap also makes an appearance in this area as you would expect from the schematic.

Easy to confirm with with DMM, keeping in mind the AC voltage will vary with input voltage and load - but the difference between 11V and 15V winding should be quite obvious.
PA0PBZ:
Just a fair warning: Wherever you are going to find your 11V AC it will not be independent of the rest of the circuit, so depending on what you want to use it for think twice!
samson:
Just a Note, With out the project hooked up to the transformer the voltage on terminal 9 and 10 on the transformer is 16.04vac. When I hook up my project which I need 15 volts ac and not 11volts ac. The voltage on terminal 9 and 10 drops to 15.87volts. Is this ok . Please advice.
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