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Questions tagged [diac]

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3
votes
1answer
41 views

Questions regarding eliminating hysteresis in ac dimmer

In the following circuit it says: “This hysteresis effect can be eliminated however, using the circuit from a detailed application note from Littelfuse shown in Fig. 6.4.4. Here the capacitor C1 is ...
0
votes
1answer
52 views

High(er) Current AC Flasher Circuit

I'm trying to develop a flasher circuit for an aircraft warning light like the one shown at https://flightlight.com/products/obstruction-lights-controls-faa-l-810/. The light will be powered with ...
0
votes
2answers
649 views

110V Sewing Machine Plugged into 220V - DIAC Blew?

Our 110V Brother Sewing Machine got plugged into the 220V side of our step down transform. After a short pop, it does not turn on. I pulled the power supply board out and it seems like just a input ...
3
votes
4answers
349 views

one-way AC power

Is there a device to only allow AC power to "flow" one-way? Scenario: I have a circuit in which I would like to draw AC power from two sources: One source is good ole wall (grid) power and the other ...
0
votes
1answer
913 views

SCR triggering using DIAC

I've found this method of triggering of the SCR through DIAC and I'm trying to understand it. I was able to figure out the whole trigger circuit and how to compute the values of RC in order to have ...
0
votes
2answers
839 views

Two or more Diac Triac dimmers in parallel

I wanted to know whether connecting two or more simple diac-triac ac lamp dimmers in parallel with the same load cause any problems? I do not want to connect them in series, just parallel will be ...
0
votes
3answers
4k views

Zero crossing detection and Light dimmer

I am confused by zero crossing detection of opto-triac. I know what is the zero crossing detection or switch. (ZCS) Zero crossing detects what is the point that wave is going to positive to negative ...
1
vote
0answers
182 views

What is the correct method for Triac supply?

I need to know what is the correct power supply for fallowing light dimmer circuit that operate by 230V/50Hz AC supply. It should be neutral(N) to MT1 or live(L) to MT1? If can use both, what is the ...
-1
votes
2answers
248 views

Can someone help me understand DIACs and TRIACs

These are something that has confused me for quite some time. Just like a lot of you, I'm sure, I'm a tinkerer. I like to take things apart, salvage parts, etc. A lot of stuff I take apart have a ...
0
votes
1answer
1k views

Is it possible to replace a DIAC circuit with an SCR circuit to drive a TRIAC

I have a triac DIAC cirtcuit. I don't have any DIACs on hand, but I do have plenty of TN1215s. Is it possible to generate the required pulses using an SCR to drive the TRIAC's gate?
0
votes
2answers
3k views

Phase control up to 40A with TRIAC and DIAC (Optocoupler)

I'm projecting a phase control to control the power given to a resistive load of 6 Ohms using a PLC, TRIAC (BTA40-400), DIAC (Optocoupler MOC3023) and a zero crossing detector (4N25). I've simulated ...
0
votes
1answer
144 views

Why isn't the switches being bypassed in this triac/diac circuit?

Just when you think you understand circuits, there's always a curve ball to derail you and leave you scratching your head. The diagram below is a Triac/Diac speed controller for a reciprocating saw. ...
1
vote
3answers
5k views

Light dimming regulator circuit

Here in this circuit, We have the load connected to a diac and triac circuit along with a variable resistance and a capacitor. When the circuit operation begins initially, the energy is stored in ...
0
votes
1answer
517 views

A question about very simple light Dimmer circuit?

I've learned that a Triac works as a switch for controlling AC current. Why not connecting the load (L1) and Triac in series? at the position of red arrow? My reason is that a small amount of current ...