microcurrent frequency specific device?

How To Create Frequency Specific Microcurrent?

I am looking to build a two channel (A/B) microcurrent (allowing from 20 - 600 microamps) with selectable frequencies ranging from 3 to 970 Hz). This is based on a medical device that I'm looking to replicate. I've figured out some of this but again, considering the wealth of knowledge here I'm sure some would know the best way to build this.
here are specifications


Device Specs

Frequency Range: 0.1 – 999.9 Hz programmable

Wave Form: Square pulses

Duty Cycle: 50%

Current Intensity:  20μA to 400μA

Constant current generator

Output Polarity: Programmable alternating, positive or negative

Output Load Resistance 0 to 100K ohm

Output Channels: Two fully independent channels

Output Connection: 3.5 mm mono phone jacks

Programming Port: micro-USB

Memory: Professional-up to 999 programmable protocols; Patient: up to 99 programmable protocols

Power Supply: (2) AA alkaline batteries

Dimensions: 5.1 x 3.2 x 1.2 inches

Weight: 6.42 oz

here is the link i am following

iceng4 days ago
rickharris4 days ago

This looks for all the world like a TENS unit.

Transcutaneous electrical nerve stimulation

There are LOTS of DIY circuits out there


PS I have 2 of these, they do work (for me at least) although you have to play around to find the right place to put the electrodes.

I bought mine they are very cheap on Amazon. Not wort the effort to make one.