For a great interest in this device I created this electromassaging device with very
wide range of uses. It features two independent channels, each channel has its own
intensity regulation and repetition rate regulation. The frequency can be adjusted in the range of
2 - 100Hz. Maximum output voltage is 100V. Each channel has a separate on/off switch and LED indicator. The device is powered from
9V alkaline battery, you can also use 6 AA batteries, rechargeable 8.4 V battery, two Li-ion or Li-pol
or 6 - 7 rechargeable batteries 1.2 V (NiCd or NiMH). Is also possible to operate it from the AC/DC adapter 7.2 - 9V.
The device uses the integrated circuits 555 as oscillators with frequency-control and pulse width control. As the power switches NPN transistors are used. To control the intensity and frequency, logarithmic and exponential potentiometers are used. Other types I do not recommend. Higher output voltage is obtained using miniature short-proof transformers 230V / 15V 1.6 VA. Maximum output voltage is limited to 100V using neon lamps.