Delayed switching on and off?
Good morning,
I have a problem. I have an amplifier with an on/off switch. When I turn it off, the amplifier doesn't turn off completely, and it consumes power. Because I have a battery in this amplifier, it runs out after a while, so I have a switch between the battery and the amplifier.
The problem is that when I turn them on, I always have to first turn the switch on and then the switch on the consumer device to on. Otherwise, there's a loud bang because the power is immediately sent to the speakers. This means the consumer device switch has some kind of soft start or something. The same applies when turning them off. I have to first turn the consumer device switch off and then the other one.
I have two possible solutions. The first would be a time relay, but this would only improve the switching-on process.
Or a capacitor. I don't know how to calculate one, but it should have a capacitance of at least 3 seconds for the amplifier. The amplifier needs 19-24V and up to 5A. Do I also need a resistor after the capacitor?
I appreciate any help!
(2 votes)
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I guess it’s… not around 230V, and could imagine that a switch-on delay could help if it is between amplifier and speaker.
If the relay drops immediately as soon as the 12-24V voltage is switched off, the amplifier should not have a chance to leave it in the boxes even when switched off.
https://www.amazon.de/Yunso-UPC1237-Channel-Lautsprecher-Boot-Mute-Delay-Multicolor/dp/B07D4GG3WJ
That’s really good and easy idea to look at it again with the connections and Dan I’m buying it astonishingly!
There are multifunction relays.
It can be set as a switch-on delay and as a switch-off delay.
With a trick, you can also make a switch-on delay to the switch-off delay, so that it doesn’t need any more power to control.
Simply use a power surge relay for 230V. This will change every click. To turn off, you then activate the switch-on delayed relay and then activate the power surge relay that switches off everything (including turn-on relays).
It is most universal, you build a “sequencer” yourself. You can do this very cheaply and easily with an Arduino Nano. The cost of €5 and everything you need to program already, just a PC on which you install the Arduino environment. How to make LEDs time-controlled and out is always the first lesson in any Arduino course. Instead of LED, you then take an Arduino relay card. For power supply you only need any USB charging power supply as for a mobile phone.
In less than a weekend, you can learn how it is – even if you have never programmed – to make every turn and timing yourself.
Here you can even separate the Arduino completely from the power with a little trick. The incoming 230V switch over one of the relays. The first thing that makes the Arduino is to turn on this relay, the one itself stops the current. If he turns it off, then everything is powerless immediately. To start, this relay has to be bridged only with a pushbutton until the Arduino, after fractions of a second, makes and stops the relay itself. Then he makes his turn-on sequence and waits for you to press the “stop” button. Then he turns off his switch-off sequence and then he turns off the current himself.
Can you explain the circuit with the relays more precisely. I have a time relay and a normal relay at home and could try it out. Only I don’t understand exactly how the circuit is built and how it works.
Thank you very much.
Here are the relays you need for an Arduino:
https://www.amazon.de/Elegoo-Relaismodul-Optokoppler-Arduino-Raspberry/dp/B01M8G4Y7Z
And the Arduino himself:
https://www.amazon.de/AZDelivery-AZ-Nano-V3-Board Microcontroller-Book/dp/B01LWSJBTD/
A USB cable and of course a few wires and a good case to protect you from the 230V.
And a few buttons you also need:
https://www.amazon.de/gp/product/B07XRBDBXT
You need a power surge relay.
Things like in corridors with many switches (precise probes) make the “Klack-An” and “Klack-aus”.
You can do this normally by toucher. If you activate a switch-on delay, the button triggers the “Klack-Off” parallel to the normal button.
If the power surge relay has a change contact, you can connect the on-switch so that it only works when the thing is out. The switch-on delay relay naturally switches behind the power surge relay so that it will instantly become powerless when the power surge relay goes out.
But look at Arduinos, that makes it much easier from the circuit and you can easily program any switching sequence yourself with any timing.
For 230Volt??
There are circuit boards (https://www.google.com/search?client=firefox-b-d&sca_esv=600789614&sxsrf=ACQVn08plNmWZJQsx0TDvv2-hqbmIeRtew:1706028883597&q=switching-on-line)
which can be connected with a switch. After a set time, the “consumer switch” (whatever this should be) would be switched on.
So I turned on my device and it works.
Yes, the problem is, however, depending on where you put the module, switching on or off is not going or there are the sounds Knall.
You need to integrate the module so that the amplifier is switched on later.
However, since I do not know your connection in this way, neither the amplifier nor the other, which is described by you (incomprehensible), I can say nix exactly.
I can only report about my case where this kit works and exactly the switch-on tips no longer occur.
This can be built relatively easily:
https://www.meine-circuit.de/circuit/el/switching/switching-on-zone_mit_capacitor_and_relais/
http://www.dieelektronikerseite.de/Circuits/Zeitrelais,%20Einschaltverzoegert.htm
Let me know if this is the “right” way for you and you need more information.
The switching off of both switches does not have to run time-delayed, only the switching on – does it?
It must also be time delay.
Yes, it’s in the right direction. Only I need a delay when switching off.
Are you interested in a solution? Got a proposal now.
Don’t forget, it’s going on today, yesterday for private reasons. If I’m a little out of these things, I want to test my idea by simulator. Soon more, am now curious! 😉
What does not happen at the same time?
Sorry, easy grammar… 😉 I meant that the two relays should not at the same time attract and drop, which would have to be achieved by different charging and discharging times of the two base capacitors.
Thank you so much for taking so much time on you. What does not happen at the same time?
Thank you.
Two relays, two transistors, one single switch, 4 resistors and two capacitors are required. As far as my first idea. If that works, the effort would be manageable. Before I say more, I have to try this in a simulator, I don’t want to suggest a maress.
Basically, this should work in such a way that the transistors switch the relays, but because of different adapted time constants of the charging and discharging resistors of the capacitors also adapted to the transistor base, it is not at the same time.
I’ll get in touch, maybe tomorrow.
I am superior…
And what would this electronics look like?
Then you will need two relays: one for the amplifier switch and one for the battery switch. These must then both be switched with a small electronics unit.
I don’t know how to do that with just one capacitor.
So you need something that first switches off the amplifier and then disconnects the battery after a few seconds. And vice versa, the battery is switched on and then the amplifier after a few seconds. Did I do that right?