patrickian01
New Member
Hello,
I want to build oscillators using crystals and transistors, however, I can't get them to work and I don't know why. can anyone help me with this? with the circuit, complete with the components and values as well as the math involved. If it helps, the frequency that I'm trying to obtain are ~72MHz, ~46MHz, ~63MHz, ~18MHz, ~39MHz. Now, I've tried them using an 74LS04 IC with the inverters and they work, the only problem is that all my crystals oscillate at around 1/3 of the frequency, I understand that these are overtones and the oscilloscope reports it as a square wave and I need a sine wave because I will be using it for transmission. please help me, i really really need to finish this project. thank you.
I want to build oscillators using crystals and transistors, however, I can't get them to work and I don't know why. can anyone help me with this? with the circuit, complete with the components and values as well as the math involved. If it helps, the frequency that I'm trying to obtain are ~72MHz, ~46MHz, ~63MHz, ~18MHz, ~39MHz. Now, I've tried them using an 74LS04 IC with the inverters and they work, the only problem is that all my crystals oscillate at around 1/3 of the frequency, I understand that these are overtones and the oscilloscope reports it as a square wave and I need a sine wave because I will be using it for transmission. please help me, i really really need to finish this project. thank you.