Voltage Controlled Switch
Intro: Voltage Controlled Switch
This is a little circuit that i designed that could be used for a charging controller or voltage limiter. Its very useful if you are thinking of making a solar charger.
STEP 1: Get the Stuff
To build this circuit you would need the following:
2 1k ohm resistors
2 5V zener diodes
A comparator (the one it used is a KA393)
A led
A Project Board / Breadboard
A Digital Multimeter
A variable power supply ( of your choice once its in the limits of the comparator)
Some wire
2 1k ohm resistors
2 5V zener diodes
A comparator (the one it used is a KA393)
A led
A Project Board / Breadboard
A Digital Multimeter
A variable power supply ( of your choice once its in the limits of the comparator)
Some wire
STEP 2: Assemble the Circiut
In the assembly of the circuit u can alter the circuit as you please. For instance i didn't go as exact as the schematic.
Just follow the diagram below.
Just in case you don't know how the comparator works heres a link that shows how.
home.cogeco.ca/~rpaisley4/Comparators.html
Just follow the diagram below.
Just in case you don't know how the comparator works heres a link that shows how.
home.cogeco.ca/~rpaisley4/Comparators.html
STEP 3: What Its Suppose to Do
In the circuit that i build thats not totally the same as the in the diagram, is suppose to turn on the led at 8V because i used a 5v and 3v zener. I also used a two 9 V batteries which voltages differ. The circuit i suppose to turn the led on at 8 V and any voltage lower than it should go off.
STEP 4: Tips
If turn the comparator positive and negative leads around will have the reverse effect. I mean instead of turning on at 8V it will turn off and any voltage thats lower than that it will be on. Sorry i don't have a picture of that particular instance, but i will put in one any way. [ for decorative purposes]
Also to increase the current of a load which it quite large the LED can be replaced with a P-MOSFET which will give you the gain.
Also to increase the current of a load which it quite large the LED can be replaced with a P-MOSFET which will give you the gain.
STEP 5: Thanks
Thanks for looking at this and i hope that it was helpful .Have a good and GODLY day.
39 Comments
ayieeprivates 3 years ago
The case is, I have + and - source (Mean is DC) and I have two relay(let's say relay A and relay B) which to be triggered by that source, so If source 5v then relay A triggered and if 12v then relay B triggered, both relay can't be triggered together.
edit:
All relay can triggered by 12v, so I must add transistor on relay A, so were I need is if 5v then go to relay A and 12v go to relay B.
Can you help me with some logic analog or digital?
Thanks before.
ArturoC6 7 years ago
I am making a 100v dc how do you make a comparator work with that voltage? I thought making a voltage divider then go off that. Any ideas?
josh1001 7 years ago
itsandyhorton 9 years ago
How would you make it light up a different LED if the Voltage is below 8?
josh1001 9 years ago
Elexa 11 years ago
josh1001 11 years ago
Elexa 11 years ago
Elexa 11 years ago
Elexa 11 years ago
I need to make a circuit working between 1 V and 2.4 V. I want to make a solar charger that charges a capacitor until it reaches 2.4 V, once the voltage reach 2.4 V, the switch is closed and the led lits up. At the time, 1st capacitor is discharging, I want to charge another capacitor. When the 1st capacitor discharges to 1 V, then I want to charge the 1st capacitor again and connect the load to 2nd capacitor. Please help me with this..I'll be very thankful to you.
josh1001 11 years ago
josh1001 11 years ago
Crinton 12 years ago
josh1001 12 years ago
josh1001 12 years ago
srainsdon 14 years ago
awatif1989 14 years ago
josh1001 14 years ago
rpvanpatt 14 years ago
josh1001 14 years ago