Hello, I am doing a project on a temperature control system.My controller has been designed in LabVIEW and I get a control signal of 0-5V output from DAQ which needs to be given as gate pulse to SCR.We are using an industrial circuit board which consists of pulse transformers in between our SCRs and our gate pulse input. Since the control signal is being given through a DAQ, a protection circuit is required in order to protect the DAQ from reversal voltage which might damage the equipment.I was advised by few people to us opto coupler for isolation,but the inputs to the optocoupler should be in frequency so that I would be able to get a 0-5V varying output.Inorder to use frequency I would still require f to v converter and a v to f converter.When I checked the circuit for a f to v converter using 555 timer,i see that the output is square pulses.My question is whether it is possible to give a square pulse as gate pulse. If not, what are the remedies you can propose and also if other cost-effective and simple protection circuits are available please feel free to share. Thanks Winnie
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