Download Skema :
Portable Muscular Bio-Stimulator
Password : asinan
C1 generates 150µSec. pulses at about 80Hz frequency. Q1 acts as a buffer and Q2 inverts the polarity of the pulses and drives the Transformer. The amplitude of the output pulses is set by P1 and approximately displayed by the brightness of LED D1. D2 protects Q2 against high voltage peaks generated by T1 inductance during switching.
Parts :
- 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-----100µF 25V Electrolytic Capacitor
- D1-----LED Red 5mm.
- D2-----1N4007 1000V 1A Diode
- Q1,Q2-----BC327 45V 800mA PNP Transistors
- IC1-----7555 or TS555CN CMos Timer IC
- T1-----220V Primary, 12V Secondary 1.2VA Mains transformer (see Notes)
- SW1-----SPST Switch (Ganged with P1)
- B1-----3V Battery (two 1.5V AA or AAA cells in series etc.)
- T1 is a small mains transformer 220 to 12V @ 100 or 150mA. It must be reverse connected i.e. the 12V secondary winding across Q2 Collector and negative ground, and the 220V primary winding to output electrodes.
- Output voltage is about 60V positive and 150V negative but output current is so small that there is no electric-shock danger.
- In
any case P1 should be operated by the "patient", starting with the knob
fully counter-clockwise, then rotating it slowly clockwise until the
LED starts to illuminate. Stop rotating the knob when a light itch
sensation is perceived.
Best knob position is usually near the center of its range. - In some cases a greater pulse duration can be more effective in cellulite treatment. Try changing R2 to 5K6 or 10K maximum: stronger pulses will be easily perceived and the LED will shine more brightly.
- Electrodes can be obtained by small metal plates connected to the output of the circuit via usual electric wire and can be taped to the skin. In some cases, moistening them with little water has proven useful.
- SW1 should be ganged to P1 to avoid abrupt voltage peaks on the "patient's" body at switch-on, but a stand alone SPST switch will work quite well, provided you remember to set P1 knob fully counter-clockwise at switch-on.
- Current drawing of this circuit is about 1mA @ 3V DC.
- Some commercial sets have four, six or eight output electrodes. To obtain this you can retain the part of the circuit comprising IC1, R1, R2, C1, C2, SW1 and B1. Other parts in the diagram (i.e. P1, R3, R4, D1, D2, Q2 & T1) can be doubled, trebled or quadrupled. Added potentiometers and R3 series resistors must be wired in parallel and all connected across Emitter of Q1 and positive supply.
- Commercial sets have frequently a built-in 30 minutes timer. For this purpose you can use the Timed Beeper the Bedside Lamp Timer or the Jogging Timer circuits available on this Website, adjusting the timing components to suit your needs.
Disclaimer: we can't claim or prove any therapeutic effectiveness for this device.
