LOOKING FOR GOLDSCAN 4 Schematic.

[eduardo1979]

Hello Eduardo, I want to ask you what value are the capacitors with the letter C enclosed in the photo, I could not see them in the schematic. Thanks.

100nF.

[algan]

100nF.

Hello, Eduardo, I have 4.93 volts at the output of the LM7805, but when I solder diode D15, the voltage of the LM7805 becomes 4.17 volts, when I desolder it, I still have 4.93 volts, what do you suggest, I think that this voltage should not be change

[algan]

Hello, Eduardo, I have 4.93 volts at the output of the LM7805, but when I solder diode D15, the voltage of the LM7805 becomes 4.17 volts, when I desolder it, I still have 4.93 volts, what do you suggest, I think that this voltage should not be change

More precisely, when the Q6 transistor is soldered and the voltage drops to 4.30, I tried with different types of transistors and it still drops, there is some problem, I think there is a problem when I remove the transistor, the voltage is ok

[algan]

[QUOTE=algan;n422351]

[eduardo1979]

More precisely, when the Q6 transistor is soldered and the voltage drops to 4.30, I tried with different types of transistors and it still drops, there is some problem, I think there is a problem when I remove the transistor, the voltage is ok

Don't worry about the voltage.
The scheme is correct.
You have to respect the values of the components.
The JFET transistors have to be J113.
You can remove diode D15 if you want, because the detector works without it.

[algan]

Don't worry about the voltage.
The scheme is correct.
You have to respect the values of the components.
The JFET transistors have to be J113.
You can remove diode D15 if you want, because the detector works without it.

Hi Eduardo, can you write what the idea is and what exactly it does?

[ivconic]

it is a scale connector. Omit the scale since it follows the signal rises and falls as the audio changes the same.
Unlike at the Pulse Star 2 where the same scale amplification and driving stage is separated from the audio part and then it makes more sense.
On tiny signals scale will deflect much before you hear any audio signal. Here on GS4 you will not.
Omit that scale, no use from it. Unless you want to follow only scale behavior and cut the audio completely .

[eduardo1979]

Hi Eduardo, can you write what the idea is and what exactly it does?

It's a VUMETER. I used the KA2284 model with 5 LEDS. If you want you can put it, but I assure you that it is not very helpful.
How is the progress going?
Do you have a long way to go before you start the detector and tell us how everything is going?
I suggest that you do not make changes to the circuit.
As it is it will work very well. I remember that you said in some post that you wanted to replace the J113 with a 4066.
Keep in mind that if you are going to do that, the 4066 has to be CMOS type, not just anything will do. You also have to eliminate D11.

[algan]

It's a VUMETER. I used the KA2284 model with 5 LEDS. If you want you can put it, but I assure you that it is not very helpful.
How is the progress going?
Do you have a long way to go before you start the detector and tell us how everything is going?
I suggest that you do not make changes to the circuit.
As it is it will work very well. I remember that you said in some post that you wanted to replace the J113 with a 4066.
Keep in mind that if you are going to do that, the 4066 has to be CMOS type, not just anything will do. You also have to eliminate D11.

I have ordered the integrals without LT1114, I will use some analog first instead, I think they will arrive in about 10 days, I have almost glued the elements on the board, only the power supply has been turned on

[GeoMax]

It's a VUMETER. I used the KA2284 model with 5 LEDS. If you want you can put it, but I assure you that it is not very helpful.
How is the progress going?
Do you have a long way to go before you start the detector and tell us how everything is going?
I suggest that you do not make changes to the circuit.
As it is it will work very well. I remember that you said in some post that you wanted to replace the J113 with a 4066.
Keep in mind that if you are going to do that, the 4066 has to be CMOS type, not just anything will do. You also have to eliminate D11.

Hi Eduardo1979,

Why should you remove D11? This diode is also in other Eric Foster circuits. Or have I missunderstood your post?
Further, what purpose in your circuit has D7-D11 and C13-C16? In other similar circuits with a CD4066 I have not seen this.

[eduardo1979]

Hi Eduardo1979,

Why should you remove D11? This diode is also in other Eric Foster circuits. Or have I missunderstood your post?
Further, what purpose in your circuit has D7-D11 and C13-C16? In other similar circuits with a CD4066 I have not seen this.

If we remove D7, D8, D9, D10 and C13, C14, C15, C16, the detector does not work. I tried it to save components and reduce the PCB, but the detector does not work. If you look at the original schematic of Eric's GS5 and the first TDI models, those components are also present. I built this detector more than 8 years ago and I don't remember certain things very well. There is a thread in this forum where there is a lot of talk about the GS5 where José drew the schematic. Now I am working on induction pulse detectors controlled by an ESP32 microprocessor and a 256x128 pixel LCD display.

[algan]

What is Eric's original GS5 schematic can you link to the GS5 thread?Thanks.

[eduardo1979]

What is Eric's original GS5 schematic can you link to the GS5 thread?Thanks.

In the GS5 thread there is the diagram drawn by José.

[Emersonpaz]

I got my PCBs

[Emersonpaz]

In the schematic, the diodes described as 85 are BAT85?