555 pulse electrotherapy instrument circuit

Published:2011/5/24 2:20:00 Author:TaoXi | Keyword: pulse, electrotherapy, instrument | From:SeekIC

This is one kind of no needle electronic instrument, the circuit is as shown in figure 16-34, it uses a double time base circuit 556 as the core. The astable multivibrator is composed of the left part of 556 and the R2，R3，RP1，C1, the oscillation frequency depends on the RP1's adjusting position, f=1.44/(R2+RP1+R3)C1. Another time base circuit (1/2 556) and the R6，R7，C4 constitute the monostable trigger circuit. The figure parameter's high electrical level duration is 0.295ms. This pulse sequence is amplified by the pulse transformer driver stage VT1, and gets through the output waveform rectifier circuit which is composed of the C6，D1，R8, at last it adds to the two pieces of slice shape output stages A1 and A2.



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