I've constructed a RF transmitter circuit and have been getting numerous problems. after modelling the circuit on a breadboard and testing it we got unexpected readings. these include
- 411.5hz output from the timer instead of 350hz but correct waveform (square wave)
- 17Mhz at the base of BJT Q2 instead of 27Mhz and closer to a saw tooth wave rather than the expected square wave
the circuit diagram included shows the layout and pin connection but we used a 7555 timer instead of a 555 and a 27Mhz crystal was used instead of the 25Mhz