Bone hyperplasia treatment circuit

At present, there are more and more patients with bone hyperplasia. In order to relieve the huge pain caused by bone hyperplasia to patients, patients can return to normal life.
The circuit in this example applies direct current through two electrodes to the diseased part of the patient where the drug is applied, which can effectively relieve the patient's pain and play
a role in auxiliary treatment.
    (1) Circuit composition cost The circuit of the bone hyperplasia treatment instrument consists of a power supply circuit, a timing circuit, a current adjustment circuit, a control circuit and a power supply circuit
consisting of a power switch S, a power transformer T, a rectifier diode bridge UR1, UR2, a filter capacitor C1, C2, It is composed of three-terminal integrated voltage regulator 7824,
voltage stabilizing diode vs], etc., as shown in Figure 24-8.
    (2) Working principle of the circuit:
After switching on the AC 220V voltage, an AC voltage of 35V and an AC voltage of 8V are generated on
the winding W2 and winding W3 on the secondary side of the transformer T respectively. The AC 8V voltage is rectified by UR2 bridge and filtered by c3, and then the LED is lit. Turn the timer D (set the treatment time). After the AC 35V voltage is converted into a DC voltage through the UR1 bridge rectifier , it is added to the input end of the three-terminal voltage stabilizing block through the control contact of the timer D , and then passes through cl After filtering and voltage stabilization of 7824 and VS1 , it is output from the output end of the voltage stabilizing block 7824. After current limiting by R1 and RP, it is applied to the patient's diseased part through electrode pads A and B. At the same time, the relay K2 is closed, its normally closed contact K2 is disconnected, and the normally open contact K2 is connected, so that the relay K1 is energized and the normally open contact K1 is connected.     When the treatment time ends, the contact of the timer D is disconnected, cutting off the working voltage of the input terminal of the voltage stabilizing block 7824, the relay K2 is released, its normally open contact K2 is disconnected, the normally closed contact K2 is connected, and both ends of G The voltage provides working voltage to the music alarm circuit through the normally open contacts Kl and K2 of K1, so that the circuit works and a music alarm sound is emitted from the speaker BL to remind the patient that the treatment time has arrived.