All Questions
Tagged with linear voltage-regulator
29
questions
1
vote
1
answer
114
views
Folded Overload Protection in Linear regulator
Can someone please explain how Q1 is able to protect from overload this linear circuit?
Please see below for a simpler schematic of the above:
- 524
4
votes
6
answers
1k
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How can I limit the DC input voltage from an AC rectified source to keep it within limits for 7805?
I have an AC power source that when rectified with 470 µF capacitor gives 38 V DC with no load. I have a 7805 (TO-220) which the data sheet says has a maximum input of 35 VDC. I'm trying to power an ...
- 127
0
votes
4
answers
732
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Relationship between Vin and Vout of a linear voltage regulator in saturation region
Suppose we have a linear voltage regulator:
simulate this circuit – Schematic created using CircuitLab
If Vin is above Vth Vout is costant for all values Vin may take.However if Vin is below ...
- 111
1
vote
3
answers
2k
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Linear (LM317 based?) high current / voltage regulator ( 30 amps at 0 - ~35 volts)
I'm looking to make a linear (LM317 based?) high current / voltage regulator (30 amps at 0 - ~35 volts).
I looked at some desings online but still have some problems with it.
Maybe you can guide me ...
user296633
1
vote
1
answer
480
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What is the maximum input voltage for the external voltage regulator of the stm32 bluepill?
I am referring to the regulator connected to the USB 5V ( the 5V pin), can it handle a voltage of 12v and step it down to 3.3V for the chip? If not, then what is the upper voltage limit for that ...
- 633
0
votes
1
answer
157
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Switching between ac-to-ac transformer taps in regulated linear voltage power supply
I am new to electronics and working on building regulated linear bench power supply 0v to 30v, 3A as my first project.
For better performance, wanted to switch between multiple tapas of ac-to-ac ...
0
votes
5
answers
546
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Why is the linear voltage regulator going hot although within its specification?
I'm having an issue with my NCP718 voltage regulator overheating to the point of thermal shutdown. I have attached a photo of my schematic. I am inputing ~15-20v and outputting 4V from the reg. The ...
- 15
1
vote
2
answers
455
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NCP1117 Regulator voltage feedback not working correctly
I'm having a brain fart. Reading 3.1V ish on the output. My +5V0 net is after a schottky diode with 5V + a little bit coming from the NCP1117, and another 5V0 coming from a USB connector. Reason being ...
- 143
1
vote
0
answers
112
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Linear Regulator Operation
I have a linear regulator with three pins. It's identifier is LM7805.
I've taken a look at it's datasheet and it looks unlike linear regulators I've encountered.
Is the the op amp circuit included in ...
- 121
0
votes
1
answer
440
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Linear voltage regulator failure?
I've been building USB powered audio DAC circuit which is using multiple LDO voltage regulators.
I discovered one of the regulators, namely TPS79333, which is responsible for supplying 3.3V to ...
- 11
1
vote
3
answers
884
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Simple current limiting on linear regulator
I'm building a simple 9v linear supply using a 7809. The transformer is capable of the 300mA that might be drawn (guitar effects supply). I'm looking for a a simple way of limiting the output current. ...
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1
vote
2
answers
1k
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Interpolate variable 0-24 V to power a 12 V fan and control its speed
I want to replace the two noisy 24 V brushless fans on my printer with high performance silent 12v fans, more specifically Noctua A4x10 FLX
The 3D printer hot-end fan is on continuously with 24 volts, ...
- 11
2
votes
1
answer
1k
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Linear Regulators & Ripple Rejection
I'm trying to understand the effect of ripple rejection in linear regulators since I'm using 2 LDO's in designing a linear power supply, however I'm unsure about something. A lot of datasheets have ...
- 103
0
votes
2
answers
4k
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Will this variable voltage supply with variable current limit circuit work?
I want to make a variable power supply with variable voltage and current.
Recently made a variable voltage supply using LM317 but I couldn't control the current so I want to try combining it with an ...
- 103
0
votes
2
answers
91
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Going under specs for a linear regulator?
I have a Microchip PIC board (18F46K22) which has a VIN pin to connect to a power source (7vdc + supply).
What happen if I feed 3.3V to the VIN which goes through the 5V linear regulator (ST 78M05)?
...
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