H ELECTRICITY
H03 ELECTRONIC CIRCUITRY
H03K PULSE TECHNIQUE
H03K3/00 Circuits for generating electric pulses; Monostable, bistable or multistable circuits
H03K3/02 Generators characterised by the type of circuit or by the means used for producing pulses
H03K3/027 by the use of logic circuits, with internal or external positive feedback
H03K3/03 Astable circuits