Electronic weight loss device 1

The electronic weight loss device introduced in this example can produce a variety of low-frequency electric pulse trains, which can effectively promote human body fat metabolism, have a positive effect on obese people to lose weight and digest fat, and also have a certain auxiliary therapeutic effect on liver and spleen diseases such as fatty liver.
Circuit Working Principle
The electronic weight loss instrument circuit consists of a power supply circuit, a multivibrator, a pulse width control circuit, a pulse group interval control circuit, an inverter circuit, an output control circuit and a drive output circuit, as shown in Figure 9-36.

The power circuit consists of fuses FU1, FU2, power switch Sl, power transformer Tl, rectifier bridge stack UR, filter capacitors Cl, C2, current limiting resistor R9, power indicator light-emitting diode VLl and three-terminal integrated voltage regulator ICl.
The multivibrator is composed of two NAND gate circuits Dl and D4 inside the four-NAND gate integrated circuit IC2, a quartz crystal oscillator BC, a capacitor C3, and a resistor Rl.
The pulse control circuit consists of a 12-bit binary counter/frequency divider integrated circuit IC3 and two NAND gate circuits D2 and D3 inside 1C2.
The pulse group interval control circuit is composed of a 7-bit binary counter/frequency divider integrated circuit IC4, a selector switch S2, and a NOT gate circuit D5 inside the six NOT gate integrated circuit IC5.
The inverter circuit is composed of the NOT gate circuit D6-DlO inside IC5.
The output control circuit is composed of analog switch integrated circuit IC6, button S3, resistors R6, R7 and capacitor C8.
The output drive circuit consists of transistors Vl-V4, pulse boost transformers T2, T3, potentiometers RPl, RP2, capacitors C6, C7, resistors Rl5, R16 and light-emitting diodes VL2, VL3.
After the power switch Sl is turned on, the AC 220V voltage is stepped down by Tl, rectified by UR and filtered by Cl to generate a DC voltage of 9V. One channel of this voltage is directly supplied to the output driver circuit; the other channel is regulated to +5V by ICl, which is used as the working voltage of IC2-1C6. +5V also lights up VL1 after being limited by R9.
After the multivibrator oscillates, a low-frequency oscillation signal is output from pin 3 of IC2, and this signal is added to pin 10 of lC3 in the pulse width control circuit for frequency division processing. The pulse signal after frequency division processing by IC3 is divided into two channels: one channel is output from pins 3 and 5 of IC3, and is gated and processed into a narrow pulse signal by the NAND gate circuits D2 and D3 inside IC2, and then added to the 10 pin of IC6. Pin; male pulse signal is output from pin 12 of IC3. After being divided again by IC4 in the pulse group interval control circuit, pulse signals of different frequencies are output from pins 3, 4 and 5 of IC4. The selection switch S2 selects a pulse signal of a certain frequency from the three signals output by pins 3-5 of 1C4, and then undergoes buffering, shaping and inversion processing by the NOT gate circuit inside IC5 to generate two pulses with opposite phases. The group interval control signals are added to pins 6 and 12 of IC6 respectively. The analog switches S01 and S03 inside IC6 are intermittently turned on and off under the control of the pulse signals of pins 8 and 6 of 1C5. The two external output drive circuits connected to pins 8 and 11 of lC6 work in the switching state under the control of analog switches S01 and S03 (when the analog switch S01 inside 1C6 is turned on, S03 is turned off, and the transistors Vl and VZ are turned on, V3 and V4 are cut off; when S01 is closed, S03 is turned on, Vl and V2 are cut off, and V3 and V4 are turned on). The secondary sides of pulse boost transformers T2 and T3 alternately generate high-voltage pulse trains, which are applied to the parts of the human body that need to lose weight through electrode pads a, b, c, and d.
S3 is the start button. Only when S3 is pressed to turn on the analog switches S02 and S04 inside IC6 and pin 11 of IC3 becomes low level, the pulse width control circuit and the pulse group interval control circuit will work, and the output driver circuit will function. High voltage pulses are generated.
Component selection
Rl-R16 all use 1/4W carbon film resistors or metal film resistors.
Both RPl and RP2 use small synthetic carbon film potentiometers.
Cl selects an aluminum electrolytic capacitor with a withstand voltage of 25V; C2 selects an aluminum electrolytic capacitor with a withstand voltage of 16V; C3 selects a ceramic capacitor; C4, C5 and C8 all select monolithic capacitors or polyester capacitors; C6 and C7 all select durable Polyester capacitors or CBB capacitors with a voltage greater than 160V.
UR uses a 2A, 100V rectifier full bridge.
Vl and V3 both use C805O silicon NPN transistors; V2 and V4 both use 2SC2611 or D2611 silicon NPN transistors.
ICl selects the LM7805 three-terminal integrated voltage regulator; IC2 selects the CD4011 two-terminal input four-NAND gate integrated circuit; IC3 selects the CD4040 12-bit binary counter/frequency divider integrated circuit; IC4 selects the CD4024 7-bit binary count/minute frequency converter integrated circuit; IC5 uses the CD4069 six-NOT gate integrated circuit; IC6 uses the CD4066 four-way analog electronic switch integrated circuit.
VLl-VU uses φ3mm or φ5mm high-brightness light-emitting diodes.
S1 uses an SA, 220V power switch; S2 uses a small, single-pole, three-position switch.
Tl uses a power transformer of 5W and a secondary voltage of 9V; T2 and T3 use a power transformer of 1W and 9V (when in use, the secondary windings of T2 and T3 are connected to V2 and V4 respectively).