I have a simple circuit using a 555 timer as an oscillator to output a 12v tone to an intercom system. I'd like to make a delay circuit that will turn off the output of my circuit after a delay.
- Tone output of first circuit turns on timer while passing through to intercom system for approx. 30 seconds
- Delay circuit turns off tone for a set time approx. 2-5 minutes.
- Tone passes through to intercom again for 30 seconds and then off again.
Is this possible? Using an oscillator output to run another timer circuit? Will the charging circuit cause the volume of the tone signal to drop as the timing capacitor charges?