Keying pulse signal generation circuit

Keying pulse signal generation circuit

Shown is a pulse signal generating circuit using a keyboard input circuit. Press switch S to output a series of pulse signals. When switch
S is pressed , pin ① of inverter A will form a starting pulse, and the capacitor of pin ② will be charged to form an integral signal. When the charging voltage of pin @ reaches a certain voltage value, the inverter controls the pulse signal generating circuit c to start oscillation, and pin ③ outputs a pulse signal . At the same time, the signal from pin ① passes through the inverter D and is added to the NAND gate E, ⑤ pin output keying signal.