Electronic code generating circuit for use in railroad signaling systems

An electronic code transmitter for driving a plurality of code following relays of a railroad signaling system, the electronic code transmitter comprising:

• a timing circuit for generating, at a predetermined code rate, square wave pulses with an approximate {fraction (50/50)} duty cycle;
• a driving circuit, coupled to the timing circuit, for receiving the square wave pulses and conducting, at the predetermined code rate, a power source to the plurality of code following relays;
• and
• impedance balancing circuit, coupled to an output of the driving circuit, for eliminating electrical noises associated with high impedance loads, thereby allowing the electronic code transmitter to drive code following relays of any load impedance.

An electronic code transmitter for driving a plurality of code following relays of a railroad signaling system, the electronic code transmitter comprising:

• a timer integrated circuit for generating, at a predetermined code rate, coded pulses with a predetermined duty cycle;
• a frequency regulator circuit, coupled to the timer integrated circuit, for regulating the predetermined code rate;
• and
• a controlling relay, coupled to the timer integrated circuit, for receiving the coded pulses and conducting, at the predetermined code rate, a power source to the plurality of code following relays.