All Questions
Tagged with linear power-supply
34
questions
0
votes
2
answers
120
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Trying to fix a linear power supply of an old video door phone system
I'm a novice electronics engineer and I am currently trying to fix an old linear power supply of a video door phone system.
This power supply works as intended with some of its features (12 VDC and 12 ...
- 21
0
votes
0
answers
43
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Digimess dual linear PSU
Digimess (UK) seem to have gone to the wall, broken links on their website and phone line unobtainable. I wanted try and get the circuit diagram for my LM3002 Dual 30V 1A supply because the +ve side ...
1
vote
1
answer
114
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Transistor biasing arrangement
I am trying to learn about transistor biasing, and can’t seem to wrap my head around it.
First of all I’ll explain what I’m trying to accomplish. I’m trying to build a linear 0-100 V power supply ...
- 43
3
votes
5
answers
2k
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Linear PSU design problem
I am trying to develop my own PSU for learning purposes, but would also like to be able to use it once built. The requirements are as follows:
The PSU must deliver 1 A at 35 to 40 V (max.) ...
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
3
votes
2
answers
1k
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Capacitance multiplier or parallel capacitors for ultralow noise power supply
For a linear power supply after the bridge rectifier stage, what is the best way to filter the output power?
Is it possible to use typical capacitance multiplier circuit with a power BJT or MOSFET, ...
- 43
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
1
vote
4
answers
509
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Possibly unstable output of linear power supply due to very large current amplfication
I'm designing a linear power supply with an op-amp as error amp and a Sziklai pair as output stage as a hobby project (see schematic below).
I'm worried, that the output Vo will be unstable/...
- 13
0
votes
1
answer
133
views
Is HP 6623A Linear or Switching power supply?
I have an HP 6623A DC power supply and i wonder if its Linear or Switching power supply.
I see in the manual it says linear, but i still wonder.
Why i am asking:
I am asking this, becouse after ...
- 3,404
4
votes
2
answers
3k
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How to add CC/CV feature with single LM358 for variable linear power supply?
I have a few weeks with a problem in the design of my bench power supply. First of all I have this design from this guy on YouTube https://youtu.be/_CFIovMkRyg that made a variable power supply using ...
- 51
2
votes
2
answers
522
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Power Supply Design Help- failure at higher currents
I am trying to design a 60V 6A supply to power a power amplifier.
Here is the circuit I have so far. Feel free to open it in Circuit Lab and play around:
simulate this circuit – Schematic ...
- 501
1
vote
0
answers
482
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Linear power supply and mains filtering and protection
I'm designing my first linear power supply for my project which needs dual rail 12V (the regulation from 15V to 12V is on another board, 7812 and 7912).
The +12V (+15V) rail will draw about 250mA, the ...
- 5,508
1
vote
1
answer
135
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Variable LDO implementation - capacitor size
I am designing two linear power supplies that will:
Drop 9V DC to 5V DC to power a Raspberry Pi around 2.5A
Drop 9V DC to 7.5V DC to power a DAC under 3A
I plan to use Texas Instruments LDO UCC283-...
- 11
4
votes
2
answers
746
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Can someone help me to find the right transformer for this power supply?
So my current project is building a replica of the ARP Pro Soloist synthesizer from the 70’s. The project is mostly going very smoothly, but I am having some issues with the power supply section of ...
- 151
1
vote
1
answer
1k
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Linear Power Supply Transformer
I've got a few questions regarding the power transformer used in typical linear power supplies (with full-bridge rectifier, filter capacitor, and voltage regulator).
A typical transformer datasheet ...
- 1,167