The circuit shown in the figure has basically the same configuration as the previous one, with the difference that it uses a TTL inverter that allows reaching a few tens of megahertz using devices from the LS subfamily. The formula that relates the values of the various components of the circuit with the frequency is given next to the diagram. Qs T + and T- voltages are those of the trigger points in the voltage rise and fall, since it is a trigger device. The integrated circuit used can be the 7414 and the supply must be made with 5 volts.
