Tagged Questions

6
votes
4answers
95 views

Can I achieve a one shot button without a 555?

I have a complex circuit, but my problem only relates to one small part. I have a relay, which is energised by pulling the low side low using an NPN. I would like a pushbutton to operate the ...
0
votes
1answer
57 views

I think I am looking for a specific DC relay switch

I looking for a switch not sure what kind though. let me explane: I have 2 sources one creating DC 12v, 2 one creating around 6v DC One source works for about 12 hours each day then stops the other ...
0
votes
2answers
69 views

iCMOS analog switches and multiplexers

Does anyone have any experience with Analog Devices iCMOS high voltage analog switches or multiplexers like the ADG1434 or ADG1411? The specs for iCMOS sound very impressive. But they've been ...
2
votes
2answers
92 views

Does it exist: Latching Relay with Manual Switch

I'm looking for a latching relay (so I can control its state remotely) with a manual switch (preferably with a rocker style switch, so I can control its state locally). Do these exist as I'm ...
1
vote
0answers
88 views

Lighting relay(?) with 220V leakage insensitive coil

Existing staircase lighting time-automat can not use 220V neon mini-bulb or LED lighted make-contact buttons. - These convenient buttons cause it t false-start (as if pressed) due to their ...
2
votes
2answers
440 views

Wiring a SPDT Relay

I am new to Electronics and I am currently trying to wire up a SPDT Relay. I must admit I am totally confused. I want to have a SPDT switch that simply switches the relay over. Any pointers would be ...
1
vote
3answers
111 views

what do you call a switch/relay which switches on an appliance for a given set of time?

I need a relay/switch, which would have a push-button switch upon which the button is pressed, it would power an appliance on. I have a water pump, and it's water pressure switch is defective. I ...
2
votes
1answer
189 views

Understanding a Momentary Switch Circuit to Power Up Mains

Source: http://www.amb.org/audio/epsilon24/ I have been trying to understand the operation of the above circuit. To simplify, I am ignoring K1, Q1, R4 and D2. I also assume there is a jumper across ...
1
vote
0answers
113 views

Control DC circuit with an AC lock switch

I am currently adding circuit with a horn and some lights powered by a motorcycle battery. The circuit should be using about 12v 18A. What I want to do is control the circuit with a lock switch. I've ...
2
votes
2answers
146 views

How do I get a relay to recognize when a TRRS jack is plugged into my iphone?

I'm working on a project where I would like to put an aux input in my car. I was thinking of hooking up my CD changer output wires to a relay and then hook up the aux wires to the other part of the ...
2
votes
1answer
206 views

IC 4066 Switching on Relay

I have a water detection circuit that uses 3/4's of a 4066 (SW1-3) as a 3-level sensor and the 4th to power the coil of a 12v relay which will provide power to a water pump if the water level is at ...
1
vote
2answers
261 views

Switch hookup with relay (arduino)

Hey all i have the following 5v relay board: Please ignore the light bulb hook up. That was an example on the website that had the same relay :) And i am looking to hook one of the relays up to a ...
3
votes
2answers
180 views

Is it possible to switch relay above the power spec?

I am planning to use a DC drived SPST reed relay. Below I include the spec for voltage, current and power ratings. Contact Rating: 200W Carry Current: 5A Switching Current: 3A Switching Voltage: ...
0
votes
1answer
141 views

Drive relay when “key” is connected

I'm trying to design a circuit that will drive a relay (and thus turn on a bigger circuit) when the correct "key" circuit is connected. The "key" is contained within the hashed box and functions as I ...
5
votes
2answers
939 views

Is analog SPDT IC switch same as mechanical relay?

I am working on a project which require to trigger a SPDT switch using a button to pass a small signal voltage across (~3.3V). reference circuit image below The requirement is: signal must still ...
3
votes
2answers
458 views

Digital Switching for Audio

I want to be able to digitally switch the input of a line-level preamplifier. I was considering using relays to physically connect or disconnect each source to the input of the amp, which would be ...
0
votes
2answers
537 views

How do I build a switch to automatically control my shop-vac?

I'm starting to get into woodworking and I've run across some high-end dust collectors and shop vacuums that turn on automatically a second after the tool plugged into them (such as a table saw) is ...
2
votes
3answers
185 views

Switching Question

I am designing a power control panel for the room of many applicants. In the panel there are several micro switches available for the user to turn the appliances ON/OFF. At the end of the micro-switch ...
1
vote
1answer
95 views

High current hot switch capable

I need to design a controller that can switch On and Off a line conducting high currents. the power line: it is supplied by a banks of capacitors the switch: it must close the circuit when a signal is ...
1
vote
2answers
128 views

Connect multiple in/outputs in predefined order (beginner question)

I want to create a device for my guitar pedals which can rearrange my pedals in any given order. I have the following: At the beginning of the device I have an input for my guitar. For each pedal I ...
1
vote
2answers
794 views

Need advice on microcontroler to switch relay on/off

I am trying to connect a relay (OMRON G2RL-2A DPST 12VDC) to my PICAXE 20x2 microcontroler. I also have an UNL2803A relay driver. I managed to get microcontroler to work quite nice, so I don't have ...
4
votes
2answers
195 views

relay switch selection

I know almost nothing about electronics, but I'd like to intercept the power going to a small speaker and use a relay switch to close a speaker connection on a completely different, but more powerful ...
2
votes
1answer
354 views

Need circuit to close switch on detecting current (12V)

I have a project where I need to detect whether a 12V circuit is live or not. If it is I want to close a switch (actually close a digital IO input on an Adicon SECU16 Digital IO controller). I am ...
4
votes
3answers
1k views

Why do switches and relays have lower current ratings at higher voltages?

I have a switch which reads 6A 125VAC / 3A 250VAC. I can't figure out why this would be the case. The only reason I can think of the rating is the wires and contacts are only rated to take so much ...
5
votes
3answers
288 views

Choosing a switching device

I am overwhelmed with the variety of switching devices. MOSFETS/BJTS Relays(mechanical/solidstate),optoisolated solutions, etc.. I need to support 15V, 60A bursts, should be high efficiency, and ...