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Regulating voltage so USB works with module
I recently purchased this GSM/GPS module. I would like to power this module via a USB cable but can see that it has varying input voltages. So bearing in mind that USB is 5V and that I’m an electronics...
View ArticleSimple 1.2->12V, 5A current limiter circuit with limit indicator
I have a voltage source which varies between 1.2 and 12V, and I would like to limit the current between 1mA and 5A. The voltage source is a switch mode power supply, and the current limiter has to be...
View ArticleDesigning for DC voltage drop in low gauge wire
Are there any types of DC low voltage power supplies on the retail market that can accommodate for long wire runs (18 gauge wire). I am worried about voltage drop and power failure; I’m trying to power...
View ArticleIs it safe to separate the power supplies for sensor, buffers, and ADC?
In the LT1054 datasheet it talks about needing a bjt to avoid pulling the VOUT positive with respect to GND (datasheet page 5 Vout (Pin5): http://www.linear.com/docs/2309). Now I am powering an...
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High Voltage Linear Regulator Output Not Staying Constant
I’m trying to use a 3-terminal linear regulator LR8 (Also tried TL783 and saw the same problem…) to regulate 180V from a fixed PSU down to 116V, to power some very light loads < 1mA. But when I...
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Switching regulator enable pin low, but output isn't fully off. Why?
I’m working on a battery-powered application using two Texas Instruments switching regulators and a Linear Technology pushbutton power controller: I have confirmed that when I push the button and turn...
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Voltage regulator reference capacitor values
I’ve been looking at the LM78xx. simulate this circuit – Schematic created using CircuitLab The notes state: So, input and output must be referenced to ground. C1 removes power line noise/ ripple and...
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How to build a DC-DC USB step up adjustable converter 2A? [on hold]
I’m trying to find a reliable electronic diagram for a USB adjustable converter (5V~>6V~>9v~>12V). So what I’m tying to do is to use a powerbank (it doesn’t have the off function is the draw...
View ArticleNeed help with inverter
I am wondering if it is possible too hook up an oxygen concentrator in my car for longer than normal trips. My gf needs 10 to 15 liters but can maybe get away with 10 (1 machine) for a drive. The...
View ArticleConvert 24V dc to negative 24V dc [closed]
My circuit is supplied by a 24V DC generator, but I have amplifiers in my circuit that need to be supplied by 24V and -24V, so I need to generate -24V dc from the 24V that I have from the...
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