What can be done from old power supplies

Welding torches.
1 http://s.click.aliexpress.com/e/_dW2I6rM.
2 http://s.click.aliexpress.com/e/_dUvknv8.
3 http://s.click.aliexpress.com/e/_dYT0FBs.

Microscopic lens.
http://s.click.aliexpress.com/e/_dXddKDC.
http://s.click.aliexpress.com/e/_d7b5IoW.

Transistor tester http://s.click.aliexpress.com/e/_dZrv7X0.

My lab tools
Multimeters
1 http://s.click.aliexpress.com/e/_dVTJhdM.
2 http://s.click.aliexpress.com/e/_dUx8dNG.
3 http://s.click.aliexpress.com/e/_d8JyXDU.
4 http://s.click.aliexpress.com/e/_Bf8bNfOI.
5 http://s.click.aliexpress.com/e/_Bf6lavEm.
6 http://s.click.aliexpress.com/e/_d6W4ZeO.
7 http://s.click.aliexpress.com/e/_dUxr3Ro.
8 http://s.click.aliexpress.com/e/_d7Vvwei.

Flayback application https://play.google.com/store/apps/details?id=flyback.transformer.en.
Transformer application https://play.google.com/store/apps/details?id=pulse.transformer.mobile.
#powersupply #AkaKasyan.

Power supply http://s.click.aliexpress.com/e/_dTgB2vC.

IC tester http://s.click.aliexpress.com/e/_dWa7HSA.

My Instagram https://www.instagram.com/akakasyan

Signal Generators.
1 http://s.click.aliexpress.com/e/_dXihASK.
2 http://s.click.aliexpress.com/e/_dYeFZyi.

Excellent quality fast turn PCB Services https://www.pcbway.com
Job archive http://www.kit-shop.org/zip/circuit1.zip
LM339 http://s.click.aliexpress.com/e/_dV9fWem
PC817 http://s.click.aliexpress.com/e/_d6hsnl0
TL431 http://s.click.aliexpress.com/e/_dVDuWuw

Existing clamps http://s.click.aliexpress.com/e/_dYDjrlM.

Audio meter http://s.click.aliexpress.com/e/_dUhuqmw.

New network https://www.youtube.com/channel/UCrhJYCA-X3sKDRKCpHeOE_w/featured.
My major network https://www.youtube.com/c/akakasyan.
2nd network https://www.youtube.com/channel/UCO9r0ovR_10Cgq8kOgnFl8Q/featured.

Tachometer http://s.click.aliexpress.com/e/_dYPonxo.