Electro muscular stimulator circuit

This electro muscular stimulator circuit is based on a 555 timer circuit. The transformer must be an 220 to 12 volts at 100-150 mA and is reverse connected in circuit.
LM555 generates pulses at 150usec, 80hz .
The output voltage of this 555 timer electro muscular stimulator circuit is about 60 volts positive and 150 volts negative but the output current is very small and there is no electric shock danger .

P1 potentiometer of bio-stimulator circuit it set the Output pulses' amplitude and should be operated by the "patient", starting with the knob fully counter-clockwise, then rotating it slowly clockwise until the LED starts to illuminate.
The functional principles of this bio-stimulator circuit is the same like the commercial bio-stimulator circuits.
P1 4K7 Linear Potentiometer
R1 180K 1/4W Resistor
R2 1K8 1/4W Resistor (see Notes)
R3 2K2 1/4W Resistor
R4 100R 1/4W Resistor
C1 100nF 63V Polyester Capacitor
C2 100uF 25V Electrolytic Capacitor
D1 LED Red 5mm.
D2 1N4007 1000V 1A Diode
Q1,Q2 BC327 45V 800mA PNP Transistors
IC1 555 CMos Timer IC
T1 220V Primary, 12V Secondary 1.2VA Mains transformer (see Notes)
SW1 SPST Switch
B1 3V Battery (two 1.5V AA or AAA cells in series etc.)