7 votes
Accepted

Powering two 12 V amplifiers wired in series from a single 24 V supply

Applying a supply voltage to two series-connected loads doesn't mean that they'll see equal input voltage, because they are dynamic loads. The input current of a Class-D amp has a pulse waveform, and ...
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3 votes
Accepted

Is there such thing as a tunable DC/DC converter?

You seem to be confusing two things: Voltage regulation, and adjustable output. Any circuit sold as a "voltage regulator" should adjust its behavior to provide the same output voltage when ...
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  • 121k
3 votes

Higher current or higher voltage from a power supply

There are two types of ratings: One is what the device does. The other is what the device is the maximum capability or limiting conditions within which the device is able to properly perform its thing....
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  • 47.3k
2 votes

Wide range power supply accepting both AC and DC from 12 to 240V

With a peak voltage range >30:1 input might be possible for low power and low DC output in buck, hysteretic or forward converters such as to drive a relay coil in your examples. The best design ...
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2 votes
Accepted

RS-485 possible ground loop

Based on your wiring diagrams and modules you use, this is not a problem of a ground loop, but a problem of completely lacking a common ground reference between RS-485 devices. While it is true that ...
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  • 90k
1 vote

Op-Amp transistor voltage regulator considerations

Much depends on how fast you need the output V8V to change when you switch off the reference. As it stands, Q6 will charge C3 (10 uF) very quickly (and perhaps cause excess current in Q6), but when ...
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1 vote
Accepted

Op-Amp transistor voltage regulator considerations

A simple fix is to add a diode in reverse parallel with the Q6 base-emitter. This will clamp the reverse voltage to 0.7 V. Adding this diode means that the opamp is discharging the load cap through ...
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  • 12.9k
1 vote

How to drive 12V from a RPi GPIO?

I would consider going to your favorite china supplier or even ebay etc. Use this term: "arduino switch opto" and expect a large choice of devices. The first one I looked at stated: "...
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  • 2,994
1 vote

How to drive 12V from a RPi GPIO?

It's always best to search for solutions with progressively narrower searches on keywords. (Socratic method, where you interact with the search engine) Then you might find a way to do it with spares, ...
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1 vote

Powering two 12 V amplifiers wired in series from a single 24 V supply

I agree that you really should not try to connect these amplifiers, or any dynamic and unequal loads, in series on a single supply. However, you might be able to get away with just one 24-12 volt DC ...
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1 vote

Higher current or higher voltage from a power supply

If the device was a resistor it wouldn't matter (assuming that the power supply maintains both limits) Say you have a 12V 12W resistor, (perhaps it's a an essential oil heater), you could use a 1A ...
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  • 26.9k
1 vote

Photovoltaic solar cell attached to load device

"I want to run a load off solar, but I don't want to involve a battery" gets asked a lot. It is a grail, but not a very workable idea IMO. You are dealing with hypothetical MPPT controllers ...
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1 vote

Photovoltaic solar cell attached to load device

If you try to withdraw too much current from the system, reality hits you hard in your face. The voltage at the load will drop, it can't stay at the set level. There's no energy to maintain the ...
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  • 1,051

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