TENS machines revisited

[HarryA1]

Hello from NE PA,

A question for you. How to TENS machines generate 40 to 60 volts

from say 4.2 volts without using a coil or transformer?

Pictured is a TENS circuit that is about 1.26 inches by 1 inch.
The battery is on the reverse side of the board.

thanks in  advance,
HarryA

 

[audioguru2]

Look in Wikipedia for Voltage Multiplier. It has an AC input to capacitors and diodes.

 

[steven chiverton]

ive built a simple tens circuit from schematics ive collected online and from there with a simple modifications ive built frequency generators and they sure work good and are great for experiments pictured here is 2 out of a bunch of frequency generators , and if you want higher frequencies a simple frequency doubler dose wonders