Modifying old LRLs

[Geo]

Hi.
For this winter there are n't new projcts... i have construct a lot of lrls.
So i decided to modify some of them.
I started with the Andy's Flind MFD.
The main problem of this project is that it oscillates when buzer is near to coil and u try to give more sensitivity.
I found the solution and now i can give more... more gain, so i believe that its a super lrl.
Problem is that the weather is not good to try it. Later....
Also i connected a FM radio with TDA7000 so to have a "second" EMF detector.

Here photos...

[Geo]

Sorry but the last photo is npt a final photo...

[abdou2014]

good luck dear friend, may i know what are the components between the output of LM386 and NE555 ?

[Geo]

Originally Posted by abdou2014

good luck dear friend, may i know what are the components between the output of LM386 and NE555 ?

clasic components as transistors... resistors etc. It is a clasic beeper by Esteban modificated a little by me.
Don't try to find a complete schematic, maybe will not work for you. Connect a signal generator and an osciloscope at your device and start the modifications. Instruments will give u all the info!!!!

[abdou2014]

what are the properties of the input signal and the final property of the signal required on the oscilloscope ???

[Geo]

The second LRL that i will try to modify is a simple pd with coil stimulator. This lrl is the one that i had with me when i visited Morgan at Portugal (2009). At photo it has a different coil.
First modify is the connection of a 18650 li-ion battery in place of 2x 9V 9F22. Also an up converter is needed so to convert the 3.7v of 18650 to 12V.

[abdou2014]

what are the other modifications Mr Geo ?