Trying to fix an old transmitter from some rc toy, I may have removed the crystal oscillator some 4~5 years ago so I can only guess it was either 27Mhz or 40Mhz.
I tried 27Mhz crystal oscillator (I don't have 40Mhz) but the transmitter didn't work on any toy that have an rc receiver (tried many), working transmitters read high (2.xx volts) on antenna, mine does not.
Transmitter uses SM6136B ic, very similar to TX-2B and have same pinout. I have seen circuits that use 27Mhz oscillators with these ics but the circuits are entirely different, anything I can do to make/modify it to work? IC appears to be fine as it does output voltage on SO pin (pin 8) when any of the switches are pressed.