I have build a circuit with the purpose of driving a ~1000VA AC motor. The motor controller fires a triac only at zero crossings. The circuit is as follows:
Both C2 and C1 are ceramic capacitors. R4 is a 5W resistor, the rest is regular 1/8W. The BTA208S-800E has a proper heatsink mounted directly to it.
The problem is this: after a few seconds of operation the circuit gets really hot and a little later starts to malfunction (random firing, loss of speed control).
The motor is from a old vacuum cleaner and therefore I have no datasheet for it (Google didn't yield any results either).
The circuit is one found on the internet, since I do not have the required knowlegde to calculate RC snubbers.