DIY TGSL STEP BY STEP BUILDING AND TESTING

[chuubaba]

Fixed. Thank you for quick remedy. Why it is silent when every component and joint i fixed is more than perfect??

NEVER run tgsl without coil!!!

Connect Tx coil and check negative rail again

[Hyena]

Populated my second TGSL board today. Connected everything with it except coil but it is silent. Power is 13V DC.

PROBLEM !
The voltage on pin 4 of lm358 is 0.36V instead of -5V. How i correct this. My c3 and c28 is 220uf 35V.
[ATTACH]43665[/ATTACH]

NEVER run tgsl without coil!!!

Connect Tx coil and check negative rail again

[chuubaba]

Populated my second TGSL board today. Connected everything with it except coil but it is silent. Power is 13V DC.

PROBLEM !
The voltage on pin 4 of lm358 is 0.36V instead of -5V. How i correct this. My c3 and c28 is 220uf 35V.

[Hyena]

Those are 100nF capacitors on the voltage rails of the LM308 Op-amp for filtering. They can be 150nf, 220nf or any other it's not critical. The PCB traces are long that's why you need capacitors on every Op-amps rail pins.

Typo: it should be 100pF

[Nandor]

Those are 100nF capacitors on the voltage rails of the LM308 Op-amp for filtering. They can be 150nf, 220nf or any other it's not critical. The PCB traces are long that's why you need capacitors on every Op-amps rail pins.

[chuubaba]

what is the value of these two capacitors highlighted in green.

[chuubaba]

Thank you daluka for the prescription. I used ordinary petrol and methalated spirit and some olive oil to make the preparation and got excellent results with this method.

[daluka]

I am struggling with finding effective/ appropriate paper for print transfer to the copper clad board.

[chuubaba]

...... As soon as I took board out of ferric chloride.......

I am struggling with finding effective/ appropriate paper for print transfer to the copper clad board. I am using butter paper but the toner always fails to adhere to it. I tape the board size butter paper to A4 paper to get the print. Do i need to change my printer settings? Or there is other effective method using ferric chloride?

[chuubaba]

As they have a way of saying you bust me the brains ! But i am going to build a new TGSL PCB or all my PCBs. For me there is no curve in the learning curve; instead its a 90* steep climb but with help and guidence from fellow members i shall make my bride up

I know it is not so very aesthetically pleasing, but they say the ugliest brides make the best wives.

[dbanner]

I know it is not so very aesthetically pleasing, but they say the ugliest brides make the best wives.

[dbanner]

So it is more common mistake than others will admit.
Here is my TGSL which works like it is demon from hell, finding deep targets.

[dbanner]

I made same mistake with my home made TGSL pcb. I didn't mirror the image when printing to CUPS. As soon as I took board out of ferric chloride, I saw my silly mistake and begin to cuss myself. But then I realized I could solder chip sockets to copper side of board and reverse legs of transistors and pay attention to diodes polarity etc.and I could solve problem. Other way is to bend legs of chips all the way to the other side. Now you will have fancy pcb that nobody but yourself can understand

[chuubaba]

i thank you. you have been very kind to pay attention

I am done with trying to help you.

[daluka]

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