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Try a peak detector - it can be reset by an external transistor, or by using an open-drain output on one of the ports.
https://falstad.com/circuit/e-peak-detect.html
(Java circuit simulator.)
You could try a NMOS transistor connected to the low side of the batteries with the gate wired to your power source and a resistor (~10k) pulling the gate to the ground. This should effectively isolate the batteries when the system is off. However, I haven't tried this, so YMMV. A NMOS...
Re: Adjusting the MC34063A regulator with an external voltag
I came up with a rather elegant solution (in my opinion :P).
I am using a small set of NMOS transistors to switch in various resistors. By doing this with a binary input of say 4 bits, I can choose between 16 levels. This shows the...
Well, I'm looking at currents of up to 5 amps. And the load may vary, sudden drops in current are not going to be unusual.
Added after 4 minutes:
And to clarify, "approximately" would be within 0.1 volts with low ripple.
I would like to make a SMPS which 'follows' the input voltage, but inverts it. For example, if I input 7 volts, I want approximately -7 volts out, and if I input 12 volts I want -12 volts out; preferably the output should go to around -3 volts to up to -18 volts. It needs to handle large...
Re: Adjusting the MC34063A regulator with an external voltag
Since the FB pin requires around 1.25 volts, how would I modulate the voltage? If the output reached the goal voltage, would I put FB at 1.25 volts?
I could try and implement some kind of software voltage divider; that might work.
I am trying to think if it is possible to adjust the MC34063A SMPS controller (or a similar controller) with an external voltage or MCU control. I could use a digital potentiometer but those are not cheap.
Is there some analog solution I can use to change the feedback pin voltage? It doesn't...
TPS61041 is a switch mode LED driver/controller. The datasheet is available from ti.com: https://www.ti.com/lit/gpn/tps61041
It is a pretty standard design for a SMPS, looks like boost to me; matches with the controller which is a boost controller.
The output voltage of the supply is 1.233V *...
Is it possible that your opamp can't set the output to zero? Make sure you have a rail-to-rail opamp or at least an opamp which can go all the way to ground.
Actually, do you need A.C. or just +250V and -250V referenced to ground? The high voltage lines can be modulated to the required frequency. If you require A.C. you'll have to build an inverter, otherwise, you can use a DC-DC converter.
Could use a simple oscillator and transformer. For example a plasma ball uses a circuit to convert 6-12Vdc into 5-7kVac @ 35 kHz. You'll probably need a large transformer to run at 150Hz, consider your application to see if you can operate at a higher frequency.
I've simulated your circuit and it seems to work well. A suggestion I would make would be to wire the opamp's inverting input (through the 2.2k-220 divider) to the output of the push-pull driver (and the positive terminal of the motor.)
Also put a 1k resistor between the opamp's output and the...
It's just that the + input to your opamp is at 6V (when ENABLE is on) and the - input will be closer to 5V when logic high.
I'm not sure how your circuit's supposed to work. You want a circuit which enables a motor and allows you to go left or right, correct? Why don't you just use a h-bridge...
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