I want to increase the power of the push-pull amplifier in this circuit. The left 555 generates a square wave and the righthand 555 is triggered by it, and the output of both is amplified by the pairs of transistors. (image below).
While the 555 has a maximum Vcc of 18 volts, the maximum Collector-base voltage and Collector-emitter voltage is 80 volts for both the NPN and PNP Darlington power transistors.
Question: Can I increase the supply voltage to the amplifier transistors to 30 volts in order to increase the audio output while keeping the 555s at +12 volts so I don't fry (highly technical term) them? (image below.)
1) Do I need a capacitor between pin 3 (the 555 Output) and the base of the NPN/PNP pair? Or use some other method of isolating the 555 output from the amplifier input? If so, do I need a capacitor or something else between the output of the left 555 and the input of the right 555?
2) How to I calculate the resulting wattage on the speaker? The speaker is a piezo tweeter, rated 200 watts, and the manufacturer suggests a 30 ohm resister in series to "prevent amplifier burnout." With an ohmmeter, the speakers show no resistance when out of the circuit, so they are not traditional 4 or 8 ohm speakers.