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**Alexismex** · 02-11-2022, 01:04 AM

**ZOUjiarui** · 02-11-2022, 01:24 AM

**ZOUjiarui** · 02-11-2022, 01:48 AM

The gpx5000 seems to have no reference value. I think I'm getting off topic.

**ZOUjiarui** · 02-11-2022, 01:50 AM

The gold scan is probably closer to it.

**ZOUjiarui** · 02-13-2022, 04:09 AM

Ultra scan lm337 I think it is used to stabilize the voltage, I can not see it can control the sound. The original may be a triode.

**ZOUjiarui** · 02-13-2022, 04:10 AM

**GeoMax** · 02-13-2022, 05:55 PM

The LM337 is used as a current limiter for the audio.

**Alexismex** · 02-14-2022, 01:22 AM

**Alexismex** · 02-14-2022, 01:31 AM

**ZOUjiarui** · 02-14-2022, 01:59 AM

Originally posted by Alexismex View Post

[ATTACH]56718[/ATTACH]

Hello, do you know what the 150k on the 555 foot 7 does?
I found that it doesn't have any connection on the PCB nor on the circuit diagram

**Krzysztof** · 02-14-2022, 08:07 PM

Most likely, it is used to choose to switch the potentiometer R2 from R3 to R1 in order to double the frequency of generator 555.

**Alexismex** · 02-14-2022, 11:55 PM

**kt315** · 02-16-2022, 01:18 PM

can anybody share pics of high resolution (5-12 MB size) of the Eric's pcb? long way to result i see here... so if you did up the matter....

**ZOUjiarui** · 02-17-2022, 08:11 AM

There is a big difference in the position of the super scan sketch and the PCB, it is the place of the ammeter, it is hard to say who is right

**ZOUjiarui** · 02-17-2022, 10:12 AM

There is also an unconnected position, which I guess does the same thing as the above.

Superscan PI