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#11
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For Saromines_R and for others who have asked for my help.
if on the emitter of TR5 there is a voltage equal to or greater than 7V: 1)- remove C2, C3 and C4 and measure voltage again, it is still higher than 7V, decrease the value of C13 (from 560pF to 470pF or 330pF) if not enough reduce also C14. Reconnect C2, C3 and C4, if the output is between 2 and 6V LRL is ok but if it is still high, go to point 2: 2)- Try for C2 0.5pF or less 3)- remove C2, C3 and C4 and try the connection with two wires which it is equivalent to a capacitor of very low capacity. You can also twist the two wires to vary the capacity. 4)- try the connection with one wire which it is equivalent to a little antenna, start with a length of 10cm and try different solutions, passing near the base of TR2 and possibly shortening if the voltage is still too high. I hope this can help, if you can not get the right voltage then you need to redesign a new pcb, preferably double-sided with one side connected to ground. |
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