Electric pulse therapy device four

Circuit Working Principle
The circuit of the electric pulse therapy instrument consists of a power supply circuit, a timing circuit and a pulse voltage generator circuit, as shown in Figure 9-4.

The power circuit consists of power switch S6, power transformer T2, rectifier bridge stack UR, resistor Rl, filter capacitors C5 and C6, power indicator LED VLl and three-terminal voltage stabilizing integrated circuit lC2.
The timing circuit is composed of resistors R1, R3-R10, light-emitting diodes VL2-VL5, capacitors C2-C4, timing switches S1-S4, reset button 55 and time base integrated circuit IC1.
The pulse voltage generator circuit is composed of transistor V, resistor Rll, potentiometers RPl, RP2, capacitor Cl, pulse transformer Tl, work indication LEDs VL6, VL7, socket XS, plug XP and electrodes ", b.
Turn on the power switch S6, after the AC 220V voltage is stepped down by T2, UR rectified, filtered by C5 and stabilized by IC2, it provides +12V working voltage for the timing circuit, and at the same time,
press S5 to turn pin 2 of IC1 to low level . , pin 3 outputs a high level, causing the pulse voltage generator circuit to oscillate, V is intermittently turned on, and a 70V pulse voltage is generated on the W4 winding of T. The pulse voltage is applied to the acupuncture points of the human body through XS, XP and electrodes a and b. on
S1 (S1a, S1b), S2 (S2a, S2b), S3 (S3a, S3b) and S4 (S4a, S3b) for some chronic diseases (such as shoulder and back pain, cervical spondylosis, limb numbness, etc.). It is a four-speed timing control switch. After pressing a switch among S1-S4, the +12V voltage charges C3 through the switch and the series resistor, so that the voltage of pins 6 and 7 of IC1 continues to rise. When the voltage at both ends of C3 exceeds 8V When, the circuit in ICl flips, pin 3 outputs a low level, causing the pulse voltage generator to stop working, and the treatment time ends. After pressing a certain switch, the light-emitting diode connected in series with the switch lights up. For example, when S2 is pressed. , VL3 lights up, R4 and R8 are connected to the +12V power supply circuit through VL3.
Adjusting the resistance of RPl can change the oscillation frequency of the pulse voltage generator so that the number of pulses changes in the range of 10-120 times/min
. The resistance value can change the intensity of the output pulse, so that the output pulse voltage changes between l0-70V.
Component selection
Rl-Rll all use 1/4W metal film resistors or carbon film resistors.
RPl uses small synthetic carbon film resistors. or organic solid potentiometer; RP2 uses a small synthetic carbon film potentiometer with a switch (power switch S6).
Cl-C3 and C4 use aluminum electrolytic capacitors with a voltage resistance of 25V; C5 and C6 use monolithic capacitors. VLl-VL7 all use φ3mm high-brightness light-emitting diodes (VL6 and VL7 can also use a
two-terminal color-changing light-emitting diode).
UR uses a 1A, 5OV rectifier bridge stack.
V uses S9012 or S8550 silicon PNP transistors.
Or 5G7555 time base integrated circuit; IC2 uses 78L12 three-terminal voltage stabilizing integrated circuit.
Tl is wound with E122 core and high-strength enameled wire. Windings Wl-W3 are each wound with 60 turns of φO.25mm enameled wire, and W4 is wound with φO.08mm. The enameled wire has 650 turns; it uses a power transformer of 1-3W and a secondary voltage of 15-17V. S2-S4 uses a bipolar four-position interlocking key switch; XS uses a φ3.5mm
micro-action button.
Mono headphone socket
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