Questions tagged [7805]
7805 Voltage Regulator IC is a member of 78xx series of fixed linear voltage regulator ICs.
93
questions
0
votes
1
answer
192
views
Feedback on astable 555 timer circuit to control MAC valve for turbo control
I have some questions and wanted to get feedback on this circuit I have put together. Basically to see if there is something I missed or obvious that I should change or should have designed ...
CommunityBot
- 1
1
vote
2
answers
366
views
Logic level switch controlled via ground (0 V)
simulate this circuit – Schematic created using CircuitLab
My goal: to convert a ground signal pulse into a +5 V signal pulse.
My question: How on earth do I do this?
Backstory: My Jeep ZJ ...
CommunityBot
- 1
2
votes
3
answers
15k
views
how to fix Heating issue of 7805?
i am using LM7805 whose output voltage 5V and Output Current 1A
i have used this to feed 5V supply for my application Circuit and
my application circuit draw 125mA current ,
even tho 125mA current ...
- 39k
0
votes
1
answer
436
views
Right Way to Step Down a PWM Signal
I need to control 4 servos using a PLC that operates with 24V. The problem is that servos use only 5V. To accomplish this, I built a simple circuit using some 7805 and a large 1000 µF capacitor to ...
- 15.7k
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?...
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 ...
- 9,270
0
votes
0
answers
41
views
In which option, the diode will make the lm78xx circuit safer
This image was taken from Fairchild's datasheet on lm78xx. I have already built a working example of it, but I am still thinking about adding some additional diode protection (D1, D2). Which option ...
- 33
3
votes
4
answers
893
views
What are these parameters on the 7805 voltage regulator datasheet?
From the datasheet for the 7805 voltage regulator this information is available.
I have multiple questions about this information, which I haven't been able to find clear answers to on Google.
What ...
- 407k
1
vote
2
answers
51k
views
How to unhide hidden pins in proteus?
Recently I was designing a PCB for my project using 89c51. I am using a 12V battery to run motor and 7805 to give 5V to 89c51. When going to ARES for PCB designing I realised the VCC pin of 89c51 is ...
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 ...
- 17.9k
1
vote
3
answers
123
views
PIC18F45Q43 44 pin TQFP power supply
I'm working on a project with PIC18F45Q43's 44 pin TQFP package. The PCB I designed had a power supply based on the 7805, but when I power the circuit; the PIC18F45Q43 burns out. I even tried powering ...
- 407k
6
votes
2
answers
376
views
What is the purpose of the 7805 output capacitor?
How does a cap on a regulator output improve transient response? Is this cap not more appropriately drawn next to the load where it is not being defeated by intervening trace inductance? Or does this ...
- 19.4k
-1
votes
1
answer
210
views
All in one PCB mount buck converter? Sounds like snake oil
I am on the hunt to power an ESP8266 and a relay from 12V while keeping the PCB as small as possible.
I am trying to avoid having to SMD the parts and have been advised against the LM7805 route as ...
- 34.6k
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 ...
- 169k
1
vote
1
answer
110
views
BCD 7447 powered by 7805 drops voltage
I am trying to use a BCD converter 7447 to display numbers on a seven segment display. Even before I apply any inputs or outputs, I observe that the VCC voltage of the 7447 drops (which is powered by ...
- 21