Whites tdi pro shematic+pcb

[Laith]

The TDI pro schematic is not tested and still has mistakes. It is for reference and repairs only. Eduardo's GS5-lite project is tested and proforms like a TDI. That would be a good to build see post 542

https://www.geotech1.com/forums/foru...hematic/page37

And bipolar pi rev2.1 is it ready??

[Altra]

I have no idea? You should ask that question on the Bi-polar thread. The TDI is mono polar

[sayan1345]

TDI PCB with Proteus

[Altra]

TDI PCB with Proteus

Like I mentioned above the schematic has some mistakes still. A major error I discovered a few days ago is D18 in the voltage doubler. The way it is connect in the schematic and on your pcb the whole circuit will not function. It will not generate the +5 volts. Google diode voltage doubler and compare to the schematic

[Detectorist#1]

Attached is the picture of the PCB with correction of the connection of D18

[Altra]

Attached is the picture of the PCB with correction of the connection of D18

Correct Detectorist. Also R6 the series resistor going to the coil is only 0.25 watt on the pcb. This will burn out right away. I think the minimum should be 2w or higher.

[Detectorist#1]

Correct Altra. Average power on this resistor is appr. 2.5W. Also, serially to D8 is correct to put current limiting resistor 10K. Also C35 no need to be Not Polarized type. The marked polarity on the board is correct. The resistance of the speaker have to be not less than 32oHms for not overheating of LM386.

[sayan1345]

thank you very much
Correct PCB

[sayan1345]

PCB with Part Number

[nejdet]

PCB with Part Number

And again the mistake with D18...

[Orbit]

Correct Altra. Average power on this resistor is appr. 2.5W. Also, serially to D8 is correct to put current limiting resistor 10K. Also C35 no need to be Not Polarized type. The marked polarity on the board is correct. The resistance of the speaker have to be not less than 32oHms for not overheating of LM386.

The fake lm 386 heats up, the original one does not heat up at all in my TDI - I took it from some device, an old radio with original Toshiba components, they all heat up from China!

[sayan1345]

hello all member
pleas look at the PCB correct or no ?
I want make this device
What do you think? Please let me know if you have any suggestions.

[sayan1345]

PCB

[algan]

I have connected the TDI power supply circuit of the LM386 integral to +5 and -5 volts and it works without any problems, it doesn't heat up and I don't know if it's fake.

[Orbit]

I have connected the TDI power supply circuit of the LM386 integral to +5 and -5 volts and it works without any problems, it doesn't heat up and I don't know if it's fake.

It's probably not in Tdi sl, it has a zener diode that limits the voltage, I don't remember what the value is, but all the lm 386 from China heated up, some less, some more. If it does not heat up, I believe that the component is real, not fake!And as I remember, those Chinese ones had hum or noise, good lm 386, when the threshold is without tone, there is almost no noise at all.