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Hi, I would like to run a laser diode in continuous operation. I found circuits using LM317 like this
There seems to be no restrictions on input voltage and load forward voltage? current is simply 1.25/R ??
I read somewhere else that input voltage has to be 2.5V more than load diode's...
Unfortunately, there isn't any datasheet as such. It's just a common DC barrel plug that I got from here
**broken link removed**
I'm just worried that the high voltage AC may cause the plug to break down and get short circuited or something.
Hi,
Can I ask if using a DC plug 2.1 mm dia barrel plug for AC power supply ( 230 V 4 A ) is a good idea? Otherwise, what kind of connector would be preferred?
I will take your advice to slowly ramp up the phase angle and see if it gets burnt out again. If it does, I will add the thermistor current limiter just to make sure.
Not switching off the light is not an option in this case, in fact they will be off most of the time, and will need to be...
There are 4 tubes, with 4.34 A per tube rms (as per prev. calculation). That comes out to 17A total RMS and 25A peak. That is, in the running condition. During the inrush, current can be 10 times of this. We must try to limit this current, right?
There seem to be some thermistors available...
I agree with the calculation of current. The 3.3 A was what was written on the tube, but then it also said 1kW. Anyway, let's say that the peak current is 25A. So, how do we control the current inrushing?
Specifications of BTA41 are as follows
I_rms (on state rms current) : 40 A
I_tsm (Non...
Hi,
The halogen lamps are 3.3A. Four of them means about 15A maximum. The triac is rated for 40A. So it really should work with just one. And in fact, the board I made before does work with just one, it just kept burning out now and then. That's why my 'solution' was to have 2 triacs, but it...
Hi KlausST. I am sorry for not supplying complete information and apologies if I come off as too demanding. I have come to realize that electrical/electronics design is a deep field and I need to do my research properly to come off with really good circuits. Hopefully this forum will help me to...
Hi,
thanks for the reply. Would it be ok to do it with 2 MOC3021s ?
The load connected are halogen lamps ( 1KW each )
What could I do about overvoltage protection and adding capacitors. Need a bit of help here, I'm not a professional electrical engineer, just a hobbyist with some experience.
Hi,
I had made a circuit in which a set of 4 halogen lamps were driven by a triac ( to control dimming)
However it resulted in frequent triac burn outs ( even though the current takes only 15A and the triac is rated for 40 ), so what I did is, I have now redone the circuit with two triacs...
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