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Can a 5V regulator connect directly to a voltage divider to obtain a 2V output?
In my circuit, a lm78l05 is used to provide +5V voltage to other parts. And now I need another +2V source to shift my input signal from +-2V to 0~4V as the ADC ad7682 limits the input signal range from...
View ArticleBest way to step down (half) battery voltage for motors
I have a 4S LIPO battery 5800mAH at 14.8V and I want to use it to power some 7.2V motors I have. The Rover 5 Chassis to be exact (https://www.sparkfun.com/products/10336), the only problem I have is I...
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Current boosting problem with 78xx
I’ve built a PCB with a 7805 based power supply on it. I tested the other parts of the PCB on a breadboard before I had the PCB made, but as the power supply circuit looked straightforward, I just took...
View ArticleVoltage regulator (LM350) gives no current
I am trying to use a Fairchild LM350 to get 8 volt output. I am using basic circuit (page 5 of datasheet) to do that. I get the voltage I want but whenever I try to measure the current (by putting the...
View Article110V output in automatic voltage regulator [closed]
Is the 110V output in an automatic voltage regulator (AVR) safe? I have an appliance rated at 250 watts 110 V, I want to use AVR because I need to protect my appliance from power surges, spikes and...
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Calculating the Resistor's Power Rating
I’m designing a couple of step-down voltage regulators based on a LM22677 chip (datasheet) and following the example: I want to get 5V and 10V from a 12V supply, but I have concerns regarding the power...
View ArticleTruck 24V->12V DC regulator gets me 13.5 volts, how can I get it to 12.0 +- 0.5?
I am wondering whether I need a new regulator or is there something that can fix my issue. BTW, what’s the deal with 24->12V regulators that all output 13.5V volts? I have quite sensitive IT...
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Can I run 12v car fan on 8v
I am planing to upgrade the radiator fans on my car and I would like to do some modifications to reduce the noise and have them run at lower speed when a curtain temperature is reached and run at full...
View ArticleStable voltage at high current
I am working on robotics project. The drive chassis is powered by a 3-cell 12V 8 Amps battery (I might also go for connecting two batteries to attain speed as my drive motors work at 24V full power)....
View ArticleAC to AC Voltage Regulater
Building a hobby related very small and simple project. Currently I run 120V through a household dimmer that feeds an AC to AC (3amp, 25.2VAC output) transformer. Problem is the circuit doesn’t seem to...
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What is the purpose of a Zener diode added to the output of a SMPS?
I studied circuit diagrams of some computer ATX power supplies. Some of them have got a Zener diode at the very end of 5V stand by line. The picture shows endpoint of the circuit – the SMPS is on the...
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Simulating a linear voltage regulator with ngspice
I am trying to simulate a simple linear regulator using gschem and ngspice. However, my output voltage varies by over a volt as my input voltage goes from 10V to 20V. Can I reduce this swing in the...
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7809 Linear Voltage Regulator Outputs in Series
I’m building a linear power supply that converts 120VAC mains voltage into multiple 9VDC, isolated outputs. I’m using this transformer that has the proper primary winding and 8 secondaries that I’ll...
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Set ground reference of a 5v DC power supply to the middle of a 24v DC power...
I have 2 isolated AC/DC power supplies. one generates a regulated 5 volt power supply and other generates a 24 volt power supply as you can see in the picture below: I also have designed a circuit (the...
View ArticleAbout battery capacity and regulation
For a portable application, I would be using a single 3.7V 2600mAh li-ion cell. The circuit requires 2.5V to 5V to function with the current requirement being 100mA. So obviously a voltage regulator is...
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Pololu S7V8A strange voltage drop when connected to load
I’ve bought new S7v8A step-up/step-down voltage regulator which should give me on output 2.7-8V. However, when using multimeter I am adjusting correct value let say to around 5V (it really doesn’t...
View ArticleHold-up time calculation with high capacity MLCCs
I am designing a linear voltage regulator for 5V (from 30V) at 10mA for a low cost application. Everything works out so far, but I need around 10ms hold-up time in case of an input voltage failure. All...
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Input to output differential voltage?
I came across this 7805 voltage regulator. In the datasheet is mentioned the current vs voltage graph. What is Input to output diferrential volatge?
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Replace Panasonic ML421 battery
I’m trying to replace a rechargeable ML421 battery in my old Panasonic FX100 camera. The specs of the old battery are here http://industrial.panasonic.com/www-cgi/jvcr13pz.cgi?E+BA+3+AAA4009+ML421+7+EA...
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TPS54383 switching regulator components.
I’m trying to build a switching regulator using the TPS54383 dual output regulator, Now I’ve got most of the components and schematic figured out here. pdf Except the inductor’s and diode; I’m running...
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