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Medical coil on PIC-controller (12V)
The brightest representative of the different variations of the treatment coil is a version of the PIC controller. It covers about 80% of all the healing frequencies [1,2], allows you to select, configure, and maintain 4 individual treatment programs. The complexity of its manufacture is not much higher than that of the coil with modulation, and the possibility of orders of magnitude more. This version of the coil has a frequency accuracy of modulation is not more than 0.04% over the entire operating range — from 0.1 to 1000 Hz, and is determined by a quartz resonator. The step size is 0.01 Hz in the range 0.1-10 Hz, 0.1 Hz, in the range of 10-100 Hz and 1 Hz in the range 100-1250 Hz. And in increments of 250 Hz it is possible to obtain the maximum possible modulation frequency of 10 kHz. The circuit is powered from any power supply (adapter) with 12V voltage and consumes only 1.2 watts of power.
Принципиальная схема лечебной катушки с модуляцией PIC-контроллером
The heart of this version of the coil is the DD1 microcontroller — PIC16F684. Despite its small external dimensions and relatively low cost, it has fairly broad capabilities: generates a frequency in the range 0.1-10000 Hz, controls the generator field coil on VT1 (modulation) sound signal (BA1) and 4-digit display (HG1). Thus it has low power consumption quartz frequency stabilization (ZQ1) and non-volatile memory. The control scheme of only three buttons — SA1-SA3 (see instruction manual). Work schemes are well documented in previous versions of the medical coil, the difference is only in the management of modulation: here it is done using microcontroller.
The following is a list used in the unit circuits, diodes and two modes. In parentheses are possible replacements:
All capacitors circuits — ceramic or polypropylene, with a nominal value of deviation of no more than 5%. Any low power resistors with a nominal deviation of not more than 20%. The coil itself (L1, L2) is wound in any of the ways suggested here.
The file for the firmware of the microcontroller is here. About how it is stitched, read the article: "Flash PIC controller is just".
For coil Assembly will fit a small plastic box: with a window under an indicator or with a transparent top. Box of metal — not suitable! The scheme is simple, so her details can be placed on the breadboard. The transistor VT1 must be installed on a small heatsink. Some of the Assembly steps shown in the following photo:
Сборка лечебной катушки. 1 Этап Сборка лечебной катушки. 2 Этап Сборка лечебной катушки. 3 Этап Сборка лечебной катушки. 4 Этап
If the circuit is assembled correctly and the microcontroller stitched, the entire coil starts working immediately without configuring. The only thing that you need to adjust the current from the power source. It is adjusted by trimming resistor R1 should be about 100mA at the maximum frequency on the display.

Accept applications for development of individual programs for treatment of the coil. This can include several (up to 10) healing frequencies switchable in series, multiple frequencies operating simultaneously, or an additional treatment program with a smoothly changing frequency in a range (sweep).

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Vyacheslav Gorchilin, 2017
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