Hey all,

I'm trying to take a +/- 10V input [called MVP_IN in my schematic] and output two signals.

1) OC1: +5V logic signal that is 5V when input is (+ve) and off otherwise.
-- used an op-amp as a comparator

2) VCO: An inverted magnitude of the input amplified to 15V.
-- used dual op amp full wave rectifier to get correct magnitude, then a second stage op amp to invert, offset and amplify the signal

An example of the desired output signals is shown attached. I simulated with a sinusoidal input.

I've attached my schematic and was hoping for some tips/critiques. The biggest thing that bothers me is the 15V offset I need to provide the VCO signal. Is there a better way of doing this? I'd appreciate any advice on any part of the IC... this is my first time designing this sort of circuit.

-d02

 

If it works in the sim and you have the outputs you want then buy some vero board and get cracking. They are only cheap parts so buy a few just incase. Ensure you have plenty of decoupling caps around the power lines.