- #1
Tom_M
- 1
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Hi all,
Building a frequency offset locking circuit for laser spectroscopy. First electronics project so been hitting a steep learning curve. Long story short, I have two branches in this circuit that take a AC signal run it through a diode and low pass filter to measure the envelope and output a DC voltage. The diode in the second branch is inverted so it gives me a negative voltage. At the end of the two branches I need a way to connect them so that the output is a sum of the 2 DC voltages...eg, when both branches are .2mV (one +, one -) the output is 0, as its being used as the error signal to the laser servo. The paper I'm working off uses a resister after each filter and then one more resister after the branches are connected...would that work? What principle is it using so I can figure out how to choose the values of the resister based on modifications I've made to the circuit design.
Cheers,
Tom
Building a frequency offset locking circuit for laser spectroscopy. First electronics project so been hitting a steep learning curve. Long story short, I have two branches in this circuit that take a AC signal run it through a diode and low pass filter to measure the envelope and output a DC voltage. The diode in the second branch is inverted so it gives me a negative voltage. At the end of the two branches I need a way to connect them so that the output is a sum of the 2 DC voltages...eg, when both branches are .2mV (one +, one -) the output is 0, as its being used as the error signal to the laser servo. The paper I'm working off uses a resister after each filter and then one more resister after the branches are connected...would that work? What principle is it using so I can figure out how to choose the values of the resister based on modifications I've made to the circuit design.
Cheers,
Tom