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In an op-amp, what does connecting the negative supply to the feedback do?
I’m trying to understand how the LM317 works? I’ve found that a good simplification is the following: So a practical example would be simulate this circuit – Schematic created using CircuitLab Where R2...
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Voltage Regulators Transistors?
I am new to electronics and I was wondering, how can I distinguish a transistor from a voltage regulator and the opposite? For example here are 2 images, 1 of a transistor and 1 of a voltage regulator....
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How does this slow turn-on regulator work?
I understand R1 & R2 are for feedback which the regulator uses to set output voltage. What is the purpose of the 50k ohm resistor, BJT, and the lower 10uF cap? Does the capacitor & resistor...
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LT8609 DC/DC stepdown not working correctly
I am using this exact circuit with the exception of a 2.7uH coil (closest available at the local parts store). It is an example provided in the LT8609 datasheet: The only load is an LED with a resistor...
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How to run a 5V device from 40V
I am working on a power supply circuit that has 0 and 40V rails. It contains a single op amp that has inputs in the 20V range. While digging through my op amp stash, I realized I only have tiny 5.5V...
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Help with understanding strange capacitor configuration arrangement
I am on a chapter of my electronics beginner’s book where the author talks about the PICAXE microcontroller. One of the first things the author mentions in this chapter is to make sure that the PICAXE...
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Should I use a regulator to improve efficiency or safety
I am considering a low power design where I do not use a regulator. The components will operate from 1.9 to 3.7 Volts. The design is powered from two primary cells(Nominal Voltage: 1.5 Volts each…total...
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TSP65070 and OMAP 1V8 pull up to 2.7V
I want to use the TPS65070, the power solution for DSP to power the OMAP L138, but i read in the errata sheet of the OMAP L138 OMAP L138 Errata page 25 that the 1V8 power supply can pull up to 2.7V...
View ArticleCan I use an electrolytic capacitor with a MCP1826S voltage regulator?
I have a MCP1826S and according to the datasheet, I should use an output capacitor of 1-10uF and with an ESR of lower than 1Ω. I have some 4.7uF electrolytic capacitors, but I think they have an ESR of...
View ArticleHow much electricity do voltage stabilizers consume?
I have recently installed a Voltage Stabilizer of 1000VA. When I got previous month’s electricity bill, I was thundered. The bill was 3 times more than what I get usually. I have not installed any new...
View ArticleChoosing an voltage regulator
I am trying to choose an regulator to drive an IC with 3.3V TYPICAL current consumption of 132mA at it’s full operation(says datasheet) The regulator we normally use has 150mA capacity. Will it be safe...
View ArticleDoes the number of batteries help when using a DC 4.5-40V to 5V DC-DC...
I bought for my Raspberry Pi 2 a module which converts a DC input of 4.5-40V To 5V 2A and has an USB output. By connecting two 3.7V Li-ion batteries in series (7.4V) my Raspberry Pi works fine. I’m...
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What makes this voltage regulator special?
I’m working on digesting the data sheet for the Texas Instruments bq34z100-g1 fuel gauge IC. I’m looking to use this chip with a 2 cell lithium polymer battery pack. If using a multi cell pack the data...
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7805 efficent circuit?
The below circuit is 12v Input & 5V max@3Ampere output. The work of the 7805 is only to open the base of the transistor.(and naturally regulate that voltage at the base to 5v) What about efficency,...
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300 Volt / 2 A – DC Power Supply
I want to design a 300 volt DC / 2 Ampere power supply, for a high-power amplifier circuit. The input can be either 220 volt AC, or 18 volt DC; both of them are available, however, 220 volt AC is...
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How to decipher coding on Voltage Regulator
I am looking to replace the voltage regulator above but I am not able to find an exact replacement and am not sure what the last three digits “203″ stand for. Can anyone help me out?
View ArticleHow can I regulate ultralow voltages?
I’m interested in using a step-up converter that has an input range of 20-500 mV (LTC3108). Is there a simple way for me to regulate the input voltage to less than 500 mV without adding significant...
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Need help understanding how to calculate the R value for LD1117
I am really trying to understand how to use adjustable voltage regulators such as the LD1117 sold by sparkfun. I had a look at the datasheet they provide in the product page but it points me to a...
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What are the causes of deterioration of an LM7805?
Please, I need help !! I have to do investigations the causes of destruction of an LM7805? for me i know that : - the defference between Vin & Vout increase the heat! - also the revers current can...
View ArticleWhy is Potier method more accurate?
Why is the Potier method more accurate than the synchronous impedance method or ampere turn method for determining the voltage regulation of a synchronous generator?
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