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I'm trying to design a circuit with 2 analog inputs (+/- 10V max. range, output impedance <1Ohm, 10mA max. current) and 1 single analog output, and I need to switch between the inputs using a TTL signal. If TTL = high, then output = input 1, and if TTL = low, then output = input 2. I was...
That was very helpful, thanks a lot.
So if I get two simple unregulated 20V or 24V AC/DC converters ('wall-warts', for example) and tie the positive output of one to the negative output of the other, and use those as the input voltages of the regulator circuit, will that give me a ground that's...
I need a regulated voltage supply with +/-15V output in order to power an instrumentation amplifier circuit. The purpose of this circuit is to avoid a ground loop, so ground needs to be referenced by the application only and not by the power supply.
I am thinking about using a solution with a...
Thank you very much pointing out the analog multiplier to me. I did some reading and I believe that some kind of analog multiplier or voltage controlled amplifier is close to what I need.
But my control signal that switches the sign is a digital TTL signal. How can I build a sign multiplier that...
I'm looking for a circuit that would allow me to invert the sign of an analog signal with a digital control signal.
I was thinking of building a unity gain amplifier and an inverting amplifier with gain -1 with 2 op amps, and use a MOSFET or such to switch between them. Does anyone have...
I'm not sure if this is the right place for my question, but I couldn't find a more suitable category for it:
I'm looking for a power supply for my NIM module. The NIM bins with built-in power supplies are quite expensive, and I don't really need a bin since I have only one module. So I'm...
The resonator is superconducting and should be low loss.
I'm unsure about the other resonances, the baseline is messy.
I will try this approach anyway.
Thanks a lot!
It is a 2-port measurement on a continuous feed line, consisting of various interconnects. And the quarter wavelength resonator is capacitively coupled to the feed line, so it's basically a reflection setup. I have measured all 4 S parameters.
I believe the measurement setup calibration was done correctly. The VNA firmware has a procedure that asked me to connect short, open, load, and thru to both ports, one at a time.
The problem is that I cannot measure close to the actual device. The feed lines consisted of multiple segments (SMA...
Thanks a lot for the reply.
The VNA is calibrated, but unfortunately I cannot measure close to the resonator since it's an experimental setup. Therefore I will have to correct for the losses numerically.
If the S parameters are just shrinking towards the origin, then I should be able to multiply...
I'm looking at the measured S-data of a resonator on a Smith Chart. I can clearly see the loop when I scan across resonance, but I'm getting a substantial insertion loss from other components in the circuit - S is below 1 when I'm off resonance.
I'm trying to fit the theoretical curve a...
Thank you very much for your reply, that is very helpful and exactly what I need.
I have 2 questions:
1.) Do I understand correctly: the purpose of the USB port is only to supply +5V (and ground) to the optocoupler output stage, right? So basically any 5V source would do, is that correct?
2.) I...
I need to read a TTL signal on the PC through the parallel port, and I'm thinking of using one of the status pins (10, 11, 12, 13, or 15).
In particular, the signal is the "output" pin of a LM555, and according to the specifications, it is around 3.3V when high when the LM555 supply voltage is...
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