Hi,
I was wandering if anyone can tell is it possible to get 90 - 120 ms time delay using only passive components i.e resisters, capacitors, inductors without using any other active component in the circuit. Thanks.
What type of signal you want to delay ? Is it a single tone (i.e. sinewave) signal or a different waveform ? Does the attenuation the delay circuit introduce to the input signal matter ?
Yes, a cable could be a solution to keed waveform.Or 30km of cable.
But unfortunately you need 30.000km with speed of light, or 20.000km of RG58 cable.
Use R-C low pass filter with proper time constant.
So exactly what is the input signal and what do you want the output to look like?
What is the load for this signal?
I think you could try to implement an all-pass filter (f.i. a bridged T equalizer). It's composed by L and C and ideally apply a constant delay to all frequency while the amplitude of the signal is not affected. Of course in pratical implementation you will have both distorsion due to non costant delay over frequency and frequency dependant attenuation.
However you should specify the width of the pulse as well as the load seen by this circuit (as already pointed out by both crutschow and mtwieg) as well as the generator impedance.
I really hope you don't plan on putting this passive delay network directly on the transducer, with no preamplifier. You need a preamplifier with a low, predictable source impedance.The input signal is heart beat voltage generated by some deformable material like piezoelectric which is like pulses of 1-2Hz, I need to delay it for 90 to 120ms without loss in the signal using passive elements only.
To those who replied, OP means milleseconds, not microseconds. One RC wont achieve 90 millesecond delay.....
A LC filter chain is the only available option for a "lossless" delay filter, it has been already addressed as "lumped element transmission line" by mtwieg. Even if the filter itself doesn't involve losses (at least when considering ideal L and C elements) it has to be driven by signal source with matched impedance which in practice requires a driver amplifier. In so far I'm not sure if the "only passive" requirement can be actually achieved.
In case the passive implementation is substantiated by specific application parameters, it would helpful to hear about it.
The specification yet lacks a signal bandwidth. I presume that you want to reproduce a specific waveform of the "1 - 2 Hz" signal, no idea if 10, 30 or 100 Hz filter cut-off frequency are acceptable. The number of filter LC elements will scale respectively.
I'm yet waiting for a bandwidth specification.Can you share some LC circuits for making delay of 90 upto 120 milliseconds.
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