DIY TGSL STEP BY STEP BUILDING AND TESTING

[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]

THANK YOU TIBUCK19.

[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 .

[dbanner]

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

[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?

[dbanner]

Here is a good tip I use sometimes whenI am looking for substitute/replacement. Cross reference the part number to NTE cross reference. Then cross reference possible replacement to same NTE database. If they match, then she is a good substitute.
This is quicker and easier than reading a ton of technical information of datasheet, looking for max. min. specs etc.
It is fast way of knowing if what you have available will work or not.

[dbanner]

What is needed is a n-channel general purpose Amp/SWITCH.

[dbanner]

The 2N5484 is not recommended for Analog/Digital switching. This is according to Fairchild, Onsemiconductor document.

https://www.google.tt/url?sa=t&source=web&rct=j&url=https://www.fairchildsemi.com/application-notes/AN/AN-6609.pdf&ved=2ahUKEwjPiJzW2PzbAhVFuVkKHd82CCsQFjAAegQIAxAB&usg=AOvVaw2ns6Gfve0Nk3IKUciG4Abr

This document is like Bible for jFET transistors

[dbanner]

Hi
2N5484 is an amplifier Transistor, you need a switch! N-channel switch

[kt315]

http://pdf.datasheetcatalog.com/datasheet/fairchild/2N5484.pdf

[Nandor]

This one says it's JFET VHF/UHF Amplifiers

http://pdf.datasheetcatalog.com/datasheets/320/72258_DS.pdf

[kt315]

Hi
2N5484 is an amplifier Transistor, you need a switch! N-channel switch like J105, J106, J107 and others too. If something is getting hot it means you have short circuit! Tx amplitude should be around 12-14 volts AC!

2n5484 is not switching transistor? did you open datasheet?

[chuubaba]

Thank you Nandor.

[Nandor]

Hi
2N5484 is an amplifier Transistor, you need a switch! N-channel switch like J105, J106, J107 and others too. If something is getting hot it means you have short circuit! Tx amplitude should be around 12-14 volts AC!

[chuubaba]

Do you approve use of 2N5484 instead of BF245C. The IC on my circuit are getting hot as i attach the 100k G.Balance POT. The voltage at Tx is 4.58V while on Rx it is 0 millivolts no coils attached