LOOKING FOR GOLDSCAN 4 Schematic.

[eduardo1979]

I guess it will be like this

Yes

[kadir6141]

Hi. The TX signal on my GS4 is 200us. all j113 gate signal is 16us.

[kadir6141]

There is -4.23v on 8 pins of IC2. 5K trimpot does not make any volt adjustments. How can I make this 15mv? Is there anyone to help?

[kadir6141]

no discrimination but good working, good deep

[pito]

How can I make this 15mv = check voltages on pins 9 and 10 . How much is changing voltage on pin 10 ?
Look post #369

[Jose]

How can I make this 15mv = check voltages on pins 9 and 10 . How much is changing voltage on pin 10 ?
Look post #369

The trimpot is adjusted between -5 and -15 millivolts measured on leg 10. The outputs of the operational amplifiers of both channels must previously be set to 0 volts.

[pito]

Voltage on pin 9 ?

[algan]

You could try to make a modification, replacing the J112 with a CD4066. The bad thing about all that is that you have to do it with cables and that is not good, because the cables generate noise and right there the noise is of no interest.

is that correct transistor to integrated CD4066 pin drain connected to pin 1 gate to pin 2 and source to pin 13 i want to modify your circuit on GS5-LITE

[eduardo1979]

is that correct transistor to integrated CD4066 pin drain connected to pin 1 gate to pin 2 and source to pin 13 i want to modify your circuit on GS5-LITE

The CD4066 is a bilateral switch, so the order of the pins does not matter. You just have to take into account the CTRL pin that must be connected where the JFET gate goes.

[kadir6141]

Voltage on pin 9 ?

hi. 9 pın - 06mv
10 pın -15mv

[pito]

To see the voltage changes on pin no. 8, the voltage on pin no. 10 must change slightly below or above the voltage on pin no. 9, in your case you won't see this because the voltage on pin no. 10 is lower than 0.06 mV, check the circuit , set pin #10 to -15mV and adjust the voltage to "0V" with a 50k potentiometer, you should observe the voltage change on pin #8.

[kadir6141]

To see the voltage changes on pin no. 8, the voltage on pin no. 10 must change slightly below or above the voltage on pin no. 9, in your case you won't see this because the voltage on pin no. 10 is lower than 0.06 mV, check the circuit , set pin #10 to -15mV and adjust the voltage to "0V" with a 50k potentiometer, you should observe the voltage change on pin #8.

Hi. Mr pito The voltage on pin 8 does not change constantly. -4.20v to -4.17v

[pito]

it is changing on pin #7 ?

[kadir6141]

it is changing on pin #7 ?

No

[pito]

Voltage on pin 5 ?, how much is changing voltage on pin 6 when turning potentiometer 50k ?