I plugged in my 1st half of my first Aleph 5 and the led went on. No music, but no smoke either. I think the input is working ok. I have no voltage drop across R14. The voltage on my output mosfets is drain +33, Gate -34, source -34. I took out Q 4 and checked it with a meter. It looked ok. Any idea of what i could have blown up? At least the power supply is working.
I had exactly the same problem. It was the R17 221k resistor that I mistook by 22k! the dam red strip did seem orange actually.
I changed itt and music is flowing perfectly!!!!
good luck!
I changed itt and music is flowing perfectly!!!!
good luck!
I will take out the Q1-Q3 and measure the Vds. I tried the other main board with the same outputs and it has a 9 volt drop across R14.I just ordered some more IRF9610 and IRFP140n's. It is always good to have some extra parts. I am sure something is not right. Thanks for your help so far.
Harvardian Boards
Has anyone finished with Harvardians boards? I have ordered more IRF610's and still can't get them to work. Any help would be welcome. In the mean time I built a Zen 4 and it is working fine. I will give it one more try. If I can't get this Aleph 5 working by the end of the week is anyone interested in the boards?😕
Has anyone finished with Harvardians boards? I have ordered more IRF610's and still can't get them to work. Any help would be welcome. In the mean time I built a Zen 4 and it is working fine. I will give it one more try. If I can't get this Aleph 5 working by the end of the week is anyone interested in the boards?😕
Hi Mike,
Don't give-up too soon. I appreciate it can be near soul-destroying when these things don't work but it will be worth the effort.
Pedro's comment about R17 is valid ..... I actually did this myself also .... doh! This produced exactly what you are describing for both Pedro and myself.
Failing this, what is Vgs across (1) the current source, (2) the output stage, (3) Q3.
Can you get a friend to look over your circuit. Trying to debug your own creations is often clouded and a fresh pair of eyes will find something you have overlooked.
Best of luck.
Mark
Don't give-up too soon. I appreciate it can be near soul-destroying when these things don't work but it will be worth the effort.
Pedro's comment about R17 is valid ..... I actually did this myself also .... doh! This produced exactly what you are describing for both Pedro and myself.
Failing this, what is Vgs across (1) the current source, (2) the output stage, (3) Q3.
Can you get a friend to look over your circuit. Trying to debug your own creations is often clouded and a fresh pair of eyes will find something you have overlooked.
Best of luck.
Mark
Mark and Pedro, thanks for the help. I have one channel working. Hopefully the next channel will be easier. I must have blown a transistor. There are only 5 on the board so I changed them all and beautiful music.
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