I require help with the following schematics of AM TX/RX ckts. I have tried to construct it the way it is shown with only slight changes:
- Instead of a 500pF variable capacitor, I have used a capacitor which can vary from 147pF to 12pF
- Instead of a BC109C, I haver used a BC109B transistor.
The problem is that after the voltage is applied, I dont get any output at the speaker end. Upon measuring the voltage on the speaker, I found that there was NO voltage across it.(I have a 0.5W, 16 ohm speaker)
Also, the voltage across the antennae on the TX side is the entire supply voltage ie 9V. Is that suppose to happen?
The schematics of both TX and RX are attached with this post.
- Instead of a 500pF variable capacitor, I have used a capacitor which can vary from 147pF to 12pF
- Instead of a BC109C, I haver used a BC109B transistor.
The problem is that after the voltage is applied, I dont get any output at the speaker end. Upon measuring the voltage on the speaker, I found that there was NO voltage across it.(I have a 0.5W, 16 ohm speaker)
Also, the voltage across the antennae on the TX side is the entire supply voltage ie 9V. Is that suppose to happen?
The schematics of both TX and RX are attached with this post.