hi guys.
am new here and this is my first thread hopefully am posting in the correct section
Ive been trying to understand the circuit of a cheep Chinese wireless door bill. Ive done the circuit in the Proteus simulator. but i couldn't get the oscillation at 315MHz. the circuit consists of encoder that produce pulses and oscillator to modulate the pulses. but in the simulator i couldnt get any oscillation hence couldn't guess if it is FM or AM.
C9018 transistors were used in the circuit, but i used 2n2222a cuz the first is not available in the simulator. please help
the circuit is attached.
am new here and this is my first thread hopefully am posting in the correct section
Ive been trying to understand the circuit of a cheep Chinese wireless door bill. Ive done the circuit in the Proteus simulator. but i couldn't get the oscillation at 315MHz. the circuit consists of encoder that produce pulses and oscillator to modulate the pulses. but in the simulator i couldnt get any oscillation hence couldn't guess if it is FM or AM.
C9018 transistors were used in the circuit, but i used 2n2222a cuz the first is not available in the simulator. please help
the circuit is attached.