As I mentioned in Post #12 of this thread, I think one of the black wires is a centertap for the 7VAC. Please remeasure and determine if this is the case before attaching the 2 black wires to the ground terminal.
The Protection circuit has a 12v regulator so feeding it 15v is fine.
It is OK to leave the 7 VAC and the Mystery wires (other blue heatshrink wires) un connected. It will not harm the transformer.
Great diagrams. I wasnt able to edit my pot post- its 8 gang. not 6... And again about the center black wire(s), there is two not just one. They measure OK as stated before with both of them (not just one of them).
Have you built up a Mains Bulb Tester (MBT)?
Use that to power On your project.
Start by sorting out the wires of your transformer.
Find which wires are connected to each other and which are NOT connected. That lets you identify the different windings. Some winding will only have two tappings. Some will have more than two tappings.
Measure the resistance of each winding.
The highest resistance windings are usually the highest voltage windings. The lowest resistance (often less than one ohm) are usually the lowest voltage windings. Label them all so you don't get confused. eg winding A tap 1 winding A tap 2, winding A tap 3.
Identify the mains winding. In Europe and many other parts of the world, the primary/mains side is blue brown. Blue is Neutral and Brown is Live. BOTH are mains and BOTH must be respected as potentially deadly.
Apply power via the MBT to the primary. Does the bulb light up, or glow brightly, or glow dimly, or stay out completely?
Come back with an answer.
Use that to power On your project.
Start by sorting out the wires of your transformer.
Find which wires are connected to each other and which are NOT connected. That lets you identify the different windings. Some winding will only have two tappings. Some will have more than two tappings.
Measure the resistance of each winding.
The highest resistance windings are usually the highest voltage windings. The lowest resistance (often less than one ohm) are usually the lowest voltage windings. Label them all so you don't get confused. eg winding A tap 1 winding A tap 2, winding A tap 3.
Identify the mains winding. In Europe and many other parts of the world, the primary/mains side is blue brown. Blue is Neutral and Brown is Live. BOTH are mains and BOTH must be respected as potentially deadly.
Apply power via the MBT to the primary. Does the bulb light up, or glow brightly, or glow dimly, or stay out completely?
Come back with an answer.
Last edited:
Thanks for the reply- already have the transformer and voltages finally figured out. See posts 12 & 13. Will use a 'poor man's variac' (light bulb unit) I made when I power up for the first time. Still waiting on the missing transistors. My 8 gang (terminal) volume pot is just about the last thing I have left to figure out is anyone can assist. If all works out will then have to figure on how to adjust the 4 variable resistors ..
Again, as stated in previous posts trans all figured out. Again need help trying to wire in the b50k 8 gang (terminal) volume pot.
- Status
- Not open for further replies.