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- Dan
Just a heads-up for everyone. R108 did NOT need to be changed in value. The problem ended up being the IPS board.
Here is the problem and the fix. The IPS board was swapped with another one. Still testing the bad IPS board.
I swapped the input transistors and had it on the bench all day with a 100mVpp 1kHz square wave running all day. Looked nice and square on the scope. I'll test it with one output pair on the spare output board to make sure it is really working.
Question for the smarter people on the group. Can I test the IPS and output board together with a +-30V bench supply if I add the 9.1k resistor to the IPS board? I plan to just add one set of transistors to the output board to make sure these last two boards are working.
I would actually run the bench supply at +-32V to make up for the losses across the diode, resistor and cap multiplier on each rail.
Yes, that's fine. Just remember to remove the 9.1K resistor before returning to the full rail voltage
The BOM has a chart on page 2. Has more to do with your transformer wattage
| Transformer for 2 Ch at 4ohms* | Expected Continous Power Out | Rail Fuses F1 & F2 | |||||
| Typical | VA | AC | DC | 8ohms | 4ohms | Min Per Rail | Max Per Rail |
| 500 | 35 | 49 | 100 | 170 | 4A | 10A | |
| 600 | 38 | 54 | 120 | 210 | 4A | 10A | |
| 700 | 40 | 57 | 150 | 250 | 5A | 10A | |
| 800 | 42 | 59 | 160 | 280 | 5A | 10A | |
| 900 | 45 | 64 | 180 | 320 | 5A | 10A | |
| 1000 | 50 | 71 | 200 | 360 | 6A | 10A | |
| Oversized | 600 | 35 | 49 | 120 | 210 | 4A | 10A |
| 700 | 38 | 54 | 150 | 250 | 5A | 10A | |
| 800 | 40 | 57 | 160 | 280 | 5A | 10A | |
| 900 | 42 | 59 | 180 | 320 | 5A | 10A | |
| 1000 | 45 | 64 | 200 | 360 | 6A | 10A | |
| 1200 | 50 | 71 | 240 | 430 | 6A | 10A | |
| * Halve the VA rating, if you use a separate transformer for each channel | |||||||
| * All power ratings are at 0° phase with a non inductive load | |||||||
| * If using a transformer with a VA rating higher than the "Oversized" section, you should drop the rail voltage by one step, as it will sag less. | |||||||
| * A transformer with dual secondary windings is prefered. |
Hi Rick,
The columb "Rail Fuses F1 & F2" should read "secondary volts AC".
Peak current needs to be calculated from the fuse data peak before opening and your SOA of the output stage. Look at elevated temperatures for safe operating area since if you're going to blow the fuse, the output stage is probably hot.
The columb "Rail Fuses F1 & F2" should read "secondary volts AC".
Peak current needs to be calculated from the fuse data peak before opening and your SOA of the output stage. Look at elevated temperatures for safe operating area since if you're going to blow the fuse, the output stage is probably hot.
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Need some help here,
I tested one board at 30v and it worked fine i
I could do all the adjustments.
Now the other one I saw that one Led (D3) was mounted backwards,so I shutdown and replaised it.
Now the Led lights up as it should.But at R111A (TP107) and R111B (TP108) I get 11v,,,and I can ajust it up some volt with the bias pot.
And after a while Q105 and Q196 gets quite hot..I can adjust CCS LTP pot.
Where do I start?
I tested one board at 30v and it worked fine i
I could do all the adjustments.
Now the other one I saw that one Led (D3) was mounted backwards,so I shutdown and replaised it.
Now the Led lights up as it should.But at R111A (TP107) and R111B (TP108) I get 11v,,,and I can ajust it up some volt with the bias pot.
And after a while Q105 and Q196 gets quite hot..I can adjust CCS LTP pot.
Where do I start?