The second circuit won't work as a practical dimmer or power control. A 10k pot / 0.1uF combo has a time constant of only 1mS, so the triac will always turn on very shortly after the mains zero-crossing.
BTA40 triac
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2nd February 2012 05:59 PM #1jjj
BTA40 triac
Hi to you wonderful Experts,
To control a water heater of 3KW6 at 220V I bought a couple of BTA40 triacs.
My friend bought a Chinese dimmer with BTU40 and I copied it (see attachment).
The Prob is that it has to use a 2W Pot and they're not cheap.
Q: Is there a way of curbing the current to the Pod so that I can use an ordinary Pod, instead?
The circuit below the Chinese one I found on the Internet. This one did not ask for a 2W Pot.
Please check if that's right, for I don't want burn them out, just to find out.
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2nd February 2012 08:28 PM #2alec_t
0My circuit designs should be regarded as experimental. Although they work in simulation, their component values may need altering or additional components may occasionally be necessary when the circuit is built. Due safety precautions should be taken with any circuit involving mains voltage or electrostatic-sensitive components.
Alec's First Law:-
Every problem has a solution (given the right information and resources).
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2nd February 2012 09:20 PM #3canadaelk
You should be able to get by with a standard pot. If you google "triac light dimmer circuit" you will get lots of hits. Note that most of these have an LC network to reduce RF introduction into the mains. E
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