DIY TGSL STEP BY STEP BUILDING AND TESTING

[dbanner]

For example, the BF245 is NTE-132 , the 2N5484 is NTE-451. Right away you know she is not exact replacement.
She may still be suitable, you will have to check out other info, but at least you know that they are not interchangeable. Make sense?

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In other words, all components that cross reference to the same NTE number are electrically the same and can be used as direct replacement

[Tibuck19]

IS Ver 3 the TGSL-EGU AKA the black board? my first attempt was also a successes once, I got a component tester and made sure all the base collectors and emitters of the transistors, were in the right orientation, however, I did not make my own coil, but I can say, when it comes to park and woodland detecting the TGSL, does a good job, just wish it went a little deeper as the decimation is lost past a certain depth. Only thing I used as reference, was what is masked on the board and info found in the forums .

[chuubaba]

THANK YOU TIBUCK19.

[Tibuck19]

THANK YOU TIBUCK19.

Im sorry its not much help but a vital thing is that the transistors be oriented correctly and the mask is deceiving, Also a a frequency count and a min of 10mhz scoop really helps.

[chuubaba]

Today I installed both BF245C. Installed all POTS and buttons but no coil yet. No component are heating. No song or tone whatsoever. Multimeter show 5.5V AC/ 2.5V DC at Tx terminals. Whats wrong? Am i in the wrong continent?

[rickb]

With no tx coil, the oscillator will not run. With no rx coil, the rx circuits have no signal to work with, and the detector will appear dead. Do you have any test equipment? An oscilloscope is needed to make any real progress in this hobby, and with no real electronics knowledge it may be nearly impossible. Every hobby has an entry requirement.

[chuubaba]

Do you have any test equipment? An oscilloscope is needed to make any real progress in this hobby............,.

I have a 20MHz analog oscilloscope. How i use at this stage

[yatahaze323]

I have a 20MHz analog oscilloscope. How i use at this stage

Build the TX and RX coils according to the TGSL_101_Part1 that's in the first post. Then hook them up to your TGSL board and test them.

[Tibuck19]

it will not beep if there is no coil or make any sound if there is not one connected

[chuubaba]

Thank you yatahaze323 and Tibuck19 for very interesting information. I attached the circuit with my oscilloscope and both Tx and Rx terminals produced wave form. I will post the pictures soon for experts like you to see as to whats going on. Time/Div knob was set at 5mS and both Volts/Div knobs were set at 0.2V AC

[chuubaba]

Here is what my Oscilloscope described about Rx (top) and Tx (Down)

[rickb]

The scope indicates about 91 Hz. That makes no sense. Are you sure the variable adjustment on the time/division control is in the "set" position? (click stop) Where exactly on the schematic are your probes connected?

[chuubaba]

I AM USING ANALOG OSCILOSCOPE. WHAT I MEANTT WAS THAT THE TIME/ DIV KNOB WAS AT 5mS MARK. SEE PICTURE TO FIND THE POINTS WHERE I HAVE CONNECTED CHANNEL 1 AND CHANNEL 2 PROBES.

The scope indicates about 91 Hz. That makes no sense. Are you sure the variable adjustment on the time/division control is in the "set" position? (click stop) Where exactly on the schematic are your probes connected?

[chevesne]

What power supply do you use?