Muscular Bio-Stimulator
(2nd Version)

Improved version of the popular circuit

Increased output voltage - More complex output wave forms

Circuit diagram:

Muscular Bio-Stimulator (2nd Version)


P1_____________100K  Linear Potentiometer
P2,P3___________10K  Linear Potentiometers

R1_____________560K  1/4W Resistor
R2______________68K  1/4W Resistor
R3,R4___________10K  1/4W Resistors
R5______________22K  1/4W Resistor
R6,R7____________4K7 1/4W Resistors
R8_____________330R  1/4W Resistor
R9_______________2K2 1/4W Resistor
R10____________470R  1/4W Resistor
R11_____________47R  1/4W Resistor

C1_______________1µF  63V Polyester Capacitor
C2,C3__________100nF  63V Polyester or Ceramic Capacitors
C4_____________220nF  63V Polyester Capacitor
C5_____________220µF  25V Electrolytic Capacitor

D1______________LED  (Any dimension, shape and color)
D2,D3________1N4148   75V 150mA Diodes

Q1____________BC547   45V 100mA NPN Transistor
Q2,Q3_________BC327   45V 800mA PNP Transistors

IC1,IC2________7555 or TS555CN CMos Timer ICs

T1_____________230V Primary, 12V Secondary 1.2VA Mains transformer (see Notes)

SW1,SW2________SPST  Toggle or Slide Switches

B1_______________3V to 9V Batteries (See Notes)


This circuit is a big improvement of the small Muscular Bio-Stimulator design, available on these pages since 2000.
Circuit improvements are due to Bo Braendstrup, from Technical University of Denmark, and feature a very effective and much safer way to adjust output amplitude. Fine adjustments of "Pulse rate" and "Pulse width" were also added, plus a switch allowing to obtain more complex wave forms of the output ac voltage signal (SW1 when closed).


The use of this device is forbidden to Pace-Maker bearers and pregnant women.
Do not place the electrodes on cuts, wounds, injuries or varices.
Obviously we can't claim or prove any therapeutic effectiveness for this device.


Disclaimer: we can't claim or prove any therapeutic effectiveness for this device.