25
votes
Smooth switching between 12 V batteries, with a toggle switch
You could add two Schottky diodes to the switch, allowing either battery to power the load via a diode. During switchover the voltage will drop 0.35 V (1N5817 @200 mA) below the voltage of ...
- 434
20
votes
Accepted
Smooth switching between 12 V batteries, with a toggle switch
A little simple maths:
In a capacitor charge, Q, and voltage, V, are related by \$ Q = CV \$.
Current is the rate of charge flow so, differentiation gives us \$ I = \frac {dQ}{dt} = C \frac {dV}{dt} ...
- 168k
15
votes
Smooth switching between 12 V batteries, with a toggle switch
This might seem overly simplistic, but I have worked around this in the past with a simple momentary switch across the main toggle switch. Holding it in connects the two 12 V sources together while ...
- 161
7
votes
Accepted
Swapping Components and Reversing Polarity
Strange and confusing set of requirements, but whatever, that is not for me to judge. You can do it with two break-before-make 2P2T toggle switches simply enough.
simulate this circuit – ...
- 46.2k
6
votes
Connecting / Soldering a Switch to Breadboard / PCB
If you are a cheap-skate, you can grind off one side of the lugs leaving a 'pin' that can be thru-hole soldered.
- 59
6
votes
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How can I modify this switch?
You can't easily or safely do what you ask.
However, you can make it so the little light shown in your picture is on all the time. It looks to be just a neon bulb with series resistor. Those take ...
- 310k
6
votes
How do you design a switch input to a MCU for ultra low power consumption?
Turning the internal pull-up (or in your case, pull-down) resistor off is indeed a way to minimize the power consumption when a switch remains asserted against that resistor.
However, by itself that ...
- 33.3k
6
votes
How to toggle relay with single push-button
The "community" bot seems to think this question needs more attention, so, I thought I would post a solution.
Note, I have simulated this circuit and it works. It is based upon a similar ...
- 16.4k
5
votes
Is there such a thing as a switch that can be actuated automatically?
The closest thing that I can think of are Syndyne SAMs (Stop Action Magnets). They are designed and primarily used for organ consoles, where the stops need to be set manually by toggling the SAM, but ...
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5
votes
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How do you design a switch input to a MCU for ultra low power consumption?
The internal pulldown has 20–50 kΩ, typically 30kΩ, which limits your choice of resistor to pull the input up.
Fortunately, you can turn the internal pulldown resistor off, which is also the ...
- 11.8k
5
votes
Can't make toggle with TC4013BP
You're missing the power supply to the IC.
Ground to pin 7
5 V to pin 16
When you press the switch, the supply voltage flows through the IC into the LED. When you release the switch, there is no ...
- 13.5k
4
votes
Efficient toggle switch
You don't need two relay: -
The circuit above also gives you an "off" facility too. Make sure your LED is current limited.
You can also buy a latching relay: -
- 426k
4
votes
Accepted
How do I build a DC time out circuit that stays off until power is toggled?
Yes, a 555 would do the job. The 555 can work in a number of ways - the one you are looking for is called "Monostable". This triggers once on the press of a button and turns itself off after a ...
- 55.9k
4
votes
Can anyone identify this manufacturer? "E3"?
Not a proper answer, but I was interested to see if a logo search would show up anything so I created one in Inkscape and dropped it and its negative into Google's Image Search. No joy. They may be of ...
- 168k
4
votes
Accepted
Can anyone identify this manufacturer? "E3"?
Dunno about the logo, but it's a Hartmann part number.
There's been a lot of consolidation in the electronics industry- maybe they bought someone up before being swallowed up themselves by Phoenix ...
- 368k
4
votes
Accepted
Electrically toggle-able switch?
Figure 1. A solenoid hold-on pushbutton switch by EMC.
There are solutions available but they're likely to be expensive and hard to come by.
Figure 2. Momentary illuminated PBs. Random web image.
...
- 168k
4
votes
Accepted
What does this switch do?
That is NOT a "circuit breaker", the Tele L unit is a SHUNT TRIP coil for a circuit breaker, in this case the breaker to the left of that unit, the DM100 C20, which is a 20A RCBO circuit ...
- 3,491
4
votes
Toggle Circuit with Pause
A micro controller would be ideal for doing this.
You could however use a 555 timer running at 1Hz, a 4017 decade counter and a 4072 dual four input OR gate. The waveform can be sliced into 10 ...
- 4,010
4
votes
Switching on an SSR on positive voltage and turn it off on negative voltage
A circuit like this should work.
The op-amp is single supply powered by the +4.5V supply.
A positive input pulse above 0.5V + 1 diode drop (about 1V) will drive the opamp output high
and it will self ...
- 146k
4
votes
Accepted
Switching on an SSR on positive voltage and turn it off on negative voltage
A schmitt trigger sure seems the way to go. The issue, as you pointed out, is that a negative input will not be appreciated.
Since the ±1.5V signal is driving a motor, I think we can assume that it's ...
- 22.2k
4
votes
Can't make toggle with TC4013BP
Switches will bounce, causing multiple clocks. You need to debounce the switch.
If you have a double-throw switch, you can use the same chip to debounce with a RS latch.
Or, you can use a Schmitt ...
- 13.4k
3
votes
Creating a momentary low pulse with a toggle switch
simulate this circuit – Schematic created using CircuitLab
Figure 1. Crude pulse-low on switch closure.
You could play with this in a simulator or try it out. You haven't given any clues what ...
- 168k
3
votes
Accepted
SP4T slider switch on two states at the same time
Is this a sign of a bad switch?
Not necessarily. Switches come in "make before break" and "break before make" variations.
In some applications it might be desirable to always have the common ...
- 168k
3
votes
Convert a toggle switch into a momentary response
You could use a schmitt trigger EXOR gate like this: -
Every time the input waveform changes state you get a positive pulse at the output and the duration of that pulse is determined by the RC time ...
- 426k
3
votes
Interrupt debouncer for switch sensor
The real answer is that you shouldn't use interrupts for this at all. You should connect the switch to an input pin and poll the pin periodically.The period of the polling should be greater than the ...
- 561
3
votes
Smooth switching between 12 V batteries, with a toggle switch
You could check out the Texas instruments Power MUX range: link.
There are some 12V versions. I have a 5V one to switch LiPo batteries on a microprocessor but I do not think it reboots as it does not ...
- 131
3
votes
Electrically toggle-able switch?
Can anyone confirm that such a product exists in a form factor like a
standard panel mount switch?
What you are describing is most likely not commercially available. The reason for this being is ...
- 74.3k
3
votes
Accepted
Solenoid switched by TIP120 transistor stopped working after two weeks
Since you confirmed in comments that the problem was the signal level, I'll explain that a little bit.
You are using an NPN transistor as what is usually called a "low side switch." Simply put, you ...
- 66.8k
3
votes
Push button for different actions in every press?
It's quite easy to do. You need to debounce the pushbutton and use it to clock a counter/decoder that drives the LEDs, eg. HC4017. Wire it to reset after the last LED.
Two chips (eg.+ 74HC7002), ...
- 368k
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