After getting over my expensive mistake, things are progressing well.
I changed the 10uf capacitor at the signal input to the speaker protection to 47uF and I now have about 3.5s delay at turn on.
I tested the Vu meters. They light up nicely with the 10vac secondary from the power transformer. Perhaps more orange the yellow with the lamp on?
I ran a sine wave from my sig gen through it to see how the calibration was:
A 9v sine wave gives 55% power.
If I am doing my maths right, that means 100% is 16v which seems a bit low given 50w into 8R is 28.3v . I will test this more once I have the amps up and running and can run a larger signal through the meter.
Not the end of the world if it is as this would mean the meter would move more at lower volumes where the amp is likely to spend most of its life.
However I need to assess the possibly the meter would get damaged the amp was ever driven to full power.
I also got my new proper psus almost all soldered up pending parts from mouser. I discovered that I was 1 capacitor short on my prefered class x2 0.1uf caps for the rectifier C,RC snubbers. Also after testing the speaker protection with a no name 47uF bipolar from our local brick and mortar. Now that it is tested I have some nichicons on order.
Now that these are (almost) done I can start mounting things properly in the chassis and working out a mounting solution for the transformers.
Once mounted I can work out the proper lead lengths for the transformers and then start termination and dressing them.
I changed the 10uf capacitor at the signal input to the speaker protection to 47uF and I now have about 3.5s delay at turn on.
I tested the Vu meters. They light up nicely with the 10vac secondary from the power transformer. Perhaps more orange the yellow with the lamp on?
I ran a sine wave from my sig gen through it to see how the calibration was:
A 9v sine wave gives 55% power.
If I am doing my maths right, that means 100% is 16v which seems a bit low given 50w into 8R is 28.3v . I will test this more once I have the amps up and running and can run a larger signal through the meter.
Not the end of the world if it is as this would mean the meter would move more at lower volumes where the amp is likely to spend most of its life.
However I need to assess the possibly the meter would get damaged the amp was ever driven to full power.
I also got my new proper psus almost all soldered up pending parts from mouser. I discovered that I was 1 capacitor short on my prefered class x2 0.1uf caps for the rectifier C,RC snubbers. Also after testing the speaker protection with a no name 47uF bipolar from our local brick and mortar. Now that it is tested I have some nichicons on order.
Now that these are (almost) done I can start mounting things properly in the chassis and working out a mounting solution for the transformers.
Once mounted I can work out the proper lead lengths for the transformers and then start termination and dressing them.
