chrissugar
Well-known member
This is the first time I'm looking seriously at the SSL clone and after studying most of the documents [schematics, PCB, comp lists] I think I discovered some errors.
In the parts list there are mentioned 25 100nF and 9 100pF capacitors. I looked at the schem and the PCB and I think something is wrong. On the PCB where is tha 202 VCA emulation circuit there is a capacitor between the 5534 and the 21XX circuit. It is in paralel with the 1K feedback resistor for the 5534. In the schem the value is 100pF, and for me it seems normal but if you use this value you need 12 100pF and only 23 100nF. If it is 100nF then I think it is because it works only as a DC amp for control voltage ??? Which is the right value?
Another thing is that on the schematic there are two 100nF in paralel with the 1000micro PSU caps, but on the PCB they are not. They are after the 10ohm resistors, at the inputs of the 78L12 and 79L12.
Also I found two ground loops on the PCB. This is not a big problem because we can cut the trace but it would be better to make the mods in a new PCB revision.
Thank you.
chrissugar
In the parts list there are mentioned 25 100nF and 9 100pF capacitors. I looked at the schem and the PCB and I think something is wrong. On the PCB where is tha 202 VCA emulation circuit there is a capacitor between the 5534 and the 21XX circuit. It is in paralel with the 1K feedback resistor for the 5534. In the schem the value is 100pF, and for me it seems normal but if you use this value you need 12 100pF and only 23 100nF. If it is 100nF then I think it is because it works only as a DC amp for control voltage ??? Which is the right value?
Another thing is that on the schematic there are two 100nF in paralel with the 1000micro PSU caps, but on the PCB they are not. They are after the 10ohm resistors, at the inputs of the 78L12 and 79L12.
Also I found two ground loops on the PCB. This is not a big problem because we can cut the trace but it would be better to make the mods in a new PCB revision.
Thank you.
chrissugar