The battery is new and measures 9.8 volts. At the junction between c3 and c5 I measure 5.2 volts.
It looks OK. The problem could be a short to GND after C5 or across R4, or a bad solder/open circuit around C2 or C5
😡😡😡😡😡😡😡😡
I'm mad as hell......
I'm using a PROEL shielded cable from pre to amp.
it is damaged!!!!
more than one month to find the problem.....😡
Ok.... preamp works, jfet are ok....
I have now another little question:
preamp have some background noise, not exactly hum but bzzzzzzzz
that disappears when touching guitar strings.
now i'm using my Gainclone with some pc speakers, the Scythe Kro Craft.
1) what can i do?
2) how to modify gain?
3) last.....!!! if i change the 3 1 meg resistors with some lowers (even 100k) what can happen?
i've never studied electronics, i am an hbbyist but i always modify schematic to learn something.
I think practice is the best way to learn something, but for me jfet are really new and i don't want to damage them...
I'm mad as hell......
I'm using a PROEL shielded cable from pre to amp.
it is damaged!!!!
more than one month to find the problem.....😡
Ok.... preamp works, jfet are ok....
I have now another little question:
preamp have some background noise, not exactly hum but bzzzzzzzz
that disappears when touching guitar strings.
now i'm using my Gainclone with some pc speakers, the Scythe Kro Craft.
1) what can i do?
2) how to modify gain?
3) last.....!!! if i change the 3 1 meg resistors with some lowers (even 100k) what can happen?
i've never studied electronics, i am an hbbyist but i always modify schematic to learn something.
I think practice is the best way to learn something, but for me jfet are really new and i don't want to damage them...
This is a bit unusual: I would guess that you act as a shield, because the internal pick-ups and wiring catch external hum (or the opposite: if everything in your setup is class II (that is not earthed)).
I suppose that all the metallic parts of your guitar are connected to the GND, as they should be.
The remedy would be a better shielding of all the elements inside the guitar: aluminum paper, or graphite spray if you are concerned about alteration of the sound.
Make more tests, with the input open, shorted, the general ground earthed if it isn't already before deciding on a modification
The circuit as it is has the maximum gain: you can only reduce it. A way to do it would be the removal of C6, or the addition of a series resistor if it is too radical.
You shouldn't modify the 1 meg resistors.
If you want to reduce the gain, insert an attenuator in the output: a fixed L type, or a potentiometer
Perfect!! The guitar belongs to a friend, it's very old and needs to be fixed in some things, noisy potentiometer, jack that doesn't make a good contact.... I don't know how to play it, I just make noise!! I think that's fine for now. Thank you so much for the help and advice you have given me. Thanks also to this wonderful forum. Greetings from Sicily!!
Thank you my friend!!
Thank you my friend!!