All Questions

Tagged with
1
vote
1answer
101 views

How does this Current Comparator Circuit Work?

I have a quick couple of questions about this circuit: The schottky diodes are obviously for minimizing slew delay but how exactly do they do this? If the non inverting input is tied to ground and ...
4
votes
1answer
889 views

Flyback diode is acting weird

I have the following schematic: Vcc can vary from 12 to 15 volts, so the design was intended to switch on the relay through a MOSFET when the input voltage is over 13.4 volts. The actual Zener I've ...
1
vote
1answer
176 views

LM311P op-amp strange behavior in comparator mode

I'm trying to build a schematic which will turn on a relay in case motorbike battery voltage will reach some level. I've ended up with the following schematic. simulate this circuit – Schematic ...
1
vote
1answer
198 views

Why does my HV monitor circuit (sometimes) fry components?

simulate this circuit – Schematic created using CircuitLab I have a high-voltage monitor circuit that illuminates an LED when HV is present, shown above. A couple of these boards have worked ...
1
vote
3answers
395 views

Do I need buffers prior to a comparator?

I have the following circuit which generates digital noise... The reason for the 2 diodes has to do with stochastic uniformity of the noise output and I don't really want address this aspect. The ...
0
votes
1answer
274 views

Setting maximum opamp input voltage by zener diodes with respect to supply voltage

When I was about to implement a circuit with a 24V supply voltage I noticed that the comparator's inverting input in the part below receiving 24V with respect to ground when the input signal goes high....
1
vote
2answers
271 views

Voltage divider or zener clamp when coupling a comparator output signal to a DAQ?

As shown in above figures above, a comparator is outputting 16V pulse signal when it is ON. For some reason I want to lower this voltage around 8V pulse. In Config 1, it is coupled to a voltage ...
0
votes
1answer
174 views

Is this something a P.L.C. would be able to do?

I wish to replace the zener diodes with a programmable chip, so that I can program the chip to do exactly what the zener diodes do in this circuit. This will then make the circuit universal to all my ...
0
votes
3answers
1k views

Fast 220v AC power failure detection

I'm building an AC-Detection circuit. I want to detect when the AC power has failed ASAP so that I can react very quickly. (like 1-3ms should be enough time) This was my first idea. It works in theory,...
3
votes
3answers
662 views

Basic comparator strange problem

I am trying to create a super simple Low Battery alert monitor, by utilizing an open-loop comparator. LBO is active-low - it's connected to a TTL input pin of a uC, running from same Vbatt voltage. ...
0
votes
1answer
1k views

non-inverting schmitt trigger op amp - replacing a zener diode on the input

I wonder if it is possible to replace the second figure below with the first one? Would both Vo output be the same on the figures below? If they are different, ...