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Circuit Operation Principle The ultrasonic therapy device circuit consists of a power supply circuit, an ultrasonic oscillation circuit, and an output circuit, as shown in Figure 9-17. 
The power circuit is composed of a battery GB, a power switch S, a filter capacitor C1, a current limiting resistor R1, and a power indicating LED VL.
The ultrasonic oscillation circuit is composed of a transistor V, a capacitor C2, a resistor R2, a potentiometer RP, and a winding W1 of the oscillation transformer T, and a winding W2.
The output circuit consists of the W3 winding of T, the æ°– indicator HL and the electrode A.
When the power switch S is turned on, the ultrasonic oscillation circuit is energized and oscillated, and its oscillation frequency is about 4OkHz. After the ultrasonic oscillation circuit oscillates, a pulse voltage of about 5 kV is generated on the winding W3 of the T.
When in use, the electrode A is contacted with the human tissue having the lesion, and the pulsed high voltage output by the T will discharge the glow of the human body through the HL to generate a discharge current. Under the action of this high-frequency weak current, human tissue can produce micro-motion massage and proper amount of heat, which can reduce inflammation and analgesia.
Adjusting the resistance of RP can change the charging speed of C2, thus changing the oscillation frequency of the ultrasonic oscillator.
Component selection
Both Rl and R2 use 1/4W metal film resistors.
The RP uses a small synthetic carbon film resistor or a variable resistor.
Cl uses an aluminum electrolytic capacitor with a withstand voltage of 25V; C2 uses a monolithic capacitor or a CBB capacitor.
VL uses φ5mm green LED.
V selects S9015 or 3CG9015 silicon NPN transistor.
S uses a small single-pole switch.
T uses a line output transformer for black and white TV sets.
HL uses the normal æ°– indicator.
GB uses l5V laminated battery or use small DC regulated power supply.