Garyl
Full Member level 5
Test signal gen and seeveral quartzs
Hey
I want to make a test signal generator with this schematic:
I want to use multiple crystals within 1MHz - 15MHz range.
The exact output frequency is not important.
I want to have 5 or 10 crystals and be able to select the active one with microcontroller.
My question is, how do I modify this circuit to handle multiple crystals?
I have two ideas.
IDEA 1 - just use many crystals and many transistors (I mean, repeat the circuit as many times as needed). Then just use microcontroller and extra transistor to power-on the desired sub-circuit when needed.
IDEA 2 - use multiple relays to select the crystal for the single shared transistor. Then just use microcontroller to drive the relays... in this case I am afraid about the noise...
What would you suggest?
Hey
I want to make a test signal generator with this schematic:
I want to use multiple crystals within 1MHz - 15MHz range.
The exact output frequency is not important.
I want to have 5 or 10 crystals and be able to select the active one with microcontroller.
My question is, how do I modify this circuit to handle multiple crystals?
I have two ideas.
IDEA 1 - just use many crystals and many transistors (I mean, repeat the circuit as many times as needed). Then just use microcontroller and extra transistor to power-on the desired sub-circuit when needed.
IDEA 2 - use multiple relays to select the crystal for the single shared transistor. Then just use microcontroller to drive the relays... in this case I am afraid about the noise...
What would you suggest?