All Questions
Tagged with 7805 linear-regulator
10
questions
4
votes
2
answers
798
views
Voltage regulator not heating up ... How?
I connected a L7805 to a water fountain that I measured to be consuming 0.1 A at 5 V to regulate power coming in from three 5 W, 12 V solar panels connected in parallel.
The regulator is not heating ...
- 41
0
votes
2
answers
350
views
LM7805 decoupling capacitors
Would it be possible to replace these combinations of ceramic and electrolytic capacitors with just a pair of low-ESR 10 μF ceramics?
Conversion from 12 V to 5 V, minimal consumption, only MAX485 ...
- 15
0
votes
1
answer
255
views
How would a using a resistor and regulator together affect a circuit?
I'm having trouble understanding a concept.
Let's just say that I have a simple circuit made using a 15V power supply.
If I have a linear 7805 5V regulator connected along the circuit, and then add an ...
0
votes
1
answer
1k
views
LM7805 Voltage Regulator stops working when input voltage increases
I have the following circuit:
simulate this circuit – Schematic created using CircuitLab
I designed the PCB, had it printed and now I am testing it.
When I power it up the following happens:
...
- 561
2
votes
2
answers
1k
views
4940v5 drop-in replacement for LM7805?
I am a novice who purchased several TO-220 L4940v5 chips thinking they were drop-in replacements for the inefficient TO-220 7805s that I've been using. But not a single one seems to work. No heat, ...
- 213
2
votes
5
answers
5k
views
Is it possible to use 7805 regulator without capacitors at its input and output pins?
I have to drive a magnetic buzzer whose current is 50mA and max. voltage is 6V. I will use 7805 regulator to drive it as my supply voltage is variable 9V to 24V DC. There will be another small load ...
- 1,479
28
votes
7
answers
41k
views
Can I use two 7805 ICs in parallel to get double current capacity?
I use a 7805 for a project where the circuit needs a higher current (~2.8 A) at 5 V. So I assume that if I use both ICs in parallel I can increase the maximum current capacity. Would it work?...
- 646
1
vote
2
answers
985
views
Connecting the linear regulator directly to AC line
There are several out of the shelf solutions: LR8 from Microchip (formaly known as Supertex product) and NCP785 from ON-Semi. The last one is able to handle up to 700 volts at the input which is ...
- 3,012
3
votes
1
answer
461
views
Choosing bypass capacitors for successive linear regulators
Background:
I am reviewing my prototype PCB to iron out previous issues. The PCB is a Bluetooth data capture unit for liquid levels and flow. I am a software programmer by trade and I have some ...
1
vote
1
answer
5k
views
Is this an appropriate way to test a 7805?
Trying to check some 7805 voltage regulators. I do not have a DC power supply and do not want to test with the circuit hooked up to mains. That leaves me and my multi-meter.
http://www.androiderode....
- 13