DIY TGSL STEP BY STEP BUILDING AND TESTING

[chuubaba]

I AM USING 12V DC

What power supply do you use?

[rickb]

91 hz should not be present anywhere on the board. Either something is very wrong with the board or your scope is malfunctioning or seriously out of calibration. It is up to you to figure out which before you go further.

Most scopes have a 1Khz reference square wave terminal on the front panel. hook a probe to it and set the time-base switch to 1 ms/div. Each full cycle should be 1 major division. If not find out why before going further.

[chuubaba]

Thank you rickb for advice. I will keep you informed about the calibration.

[rickb]

chuubaba:

Have you ever had any basic electronics training?
have you ever used a scope to repair an electronic device?

[rickb]

chuubaba:

Have you ever had any basic electronics training?
have you ever used a scope to repair an electronic device?

ਕੀ ਤੁਹਾਡੇ ਕੋਲ ਕੋਈ ਬੁਨਿਆਦੀ ਇਲੈਕਟ੍ਰੋਨਿਕ ਸਿਖਲਾਈ ਹੈ?
ਕੀ ਤੁਸੀਂ ਕਦੇ ਕਿਸੇ ਇਲੈਕਟ੍ਰਾਨਿਕ ਯੰਤਰ ਦੀ ਮੁਰੰਮਤ ਕਰਨ ਲਈ ਇੱਕ ਥਾਂ ਦੀ ਵਰਤੋਂ ਕੀਤੀ ਹੈ?


کیا آپ نے کبھی کوئی بنیادی الیکٹرانکس کی تربیت حاصل کی ہے؟
کیا آپ نے کبھی ایک الیکٹرانک آلہ کی مرمت کے لئے گنجائش استعمال کیا ہے؟

[dbanner]

Here is what my Oscilloscope described about Rx (top) and Tx (Down)
[ATTACH]43549[/ATTACH]

Your TX waveform is excellent. The Rx is good too. I suspect problem is with the board. Maybe someone is faulty or layout or tracks is shorted somewhere. You can check the signal from the output of preamp and follow it along to the FET with scope all the way through. Then you will find the right place where problem exists.

[chuubaba]

Never. I bought all equipment for DIY MD. I have such level of experience that once i was very impressed by music from my friends woofers. thinking that buying woofers will produce similar music i bought best pair in the market and plugged them directly into 220V AC outlet

chuubaba:
Have you ever had any basic electronics training?
have you ever used a scope to repair an electronic device?

[chuubaba]

The terminology like FET etc gets my ears ringing. it is more convenient for me to understand maps like pcb diagrams to highlight relevant areas

Your TX waveform is excellent. The Rx is good too. I suspect problem is with the board. Maybe someone is faulty or layout or tracks is shorted somewhere. You can check the signal from the output of preamp and follow it along to the FET with scope all the way through. Then you will find the right place where problem exists.

[chuubaba]

add a resistor 1k parallel to the speaker. then connect switch contacts to one of speaker wires you will disconnect it.

[chuubaba]

have been busy with family. new child born. today i am back again. I attached LCD and ATMEGA to my felejoo that otherwise was giving good voltage readings is now a failure also as every voltage reading has significantly diminished. Even the LCD didnt light up

We are waiting for chu to give us update on progress of his step by step TGSL, in the meantime we have popcorn and beer.

[Qiaozhi]

have been busy with family. new child born. today i am back again. I attached LCD and ATMEGA to my felejoo that otherwise was giving good voltage readings is now a failure also as every voltage reading has significantly diminished. Even the LCD didnt light up

Instead of blindly blundering around in such a random fashion, I would strongly suggest that you invest in a basic book on electronics, such as the Dummy's Guide that someone else suggested. Then things will become less of a mystery to you, and you'll be able to read schematic diagrams and start to understand more of what's being discussed in the forums. You need to learn how to swim before jumping in at the deep end.

[Andi68]

And soldering .....

[chuubaba]

I am learning from youtube videos on topics like soldering and testing components with multimeter how to attach pots veriables in a circuit etc but i am in too much hurry to build effective MD for justified reasons. at the moment four projects on table but none worked and i am yet to go into lengths of copper wires i purchased for coil building. how is the learning curve with electronics ?

Instead of blindly blundering around in such a random fashion, I would strongly suggest that you invest in a basic book on electronics, such as the Dummy's Guide that someone else suggested. Then things will become less of a mystery to you, and you'll be able to read schematic diagrams and start to understand more of what's being discussed in the forums. You need to learn how to swim before jumping in at the deep end.

[chuubaba]

i have a bit improved my soldering skills but still i am terrible

And soldering .....

[Andi68]

Practicing helps.
Very important is the right temperature