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Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
I know the Max current of the 2N3904 is 200mA. But is this at 100% duty cycle or does the duty cycle not matter.
Can I pull 240mA at 12.5% duty cycle, or even 480mA at 25% duty cycle.
You can dig one hole in an hour. If you work twice as fast, can you dig the hole in 30 minutes then rest 30...
Since they are all less than one ohm, you can try something like three x 0.47 ohm one watt resistors (carbon-type) from your local shop. This is called "middle of the road" decision.
A capacitor-fed power supply would be much simpler and much cooler.
100n in half-wave allows 3.5mA or 7mA in full wave so you can work out the value you need.
Someone pointed out:
I doubt the control circuitry is designed to supply more than 100 mA or so, and if you overload it you may damage what was a good board.
So, if you think a lamp will take 100mA when illuminated, it will require 500mA to start to turn ON. So, this is the point I am making.
The comment should have been 100 watt load. The spell-check change the word.
The resistance of a lamp is only one sixth of its final resistance and thus a 25watt lamp will "ask-for" the equivalent of 100 watt load when it is starting to illuminate and this is enough to either damage the...
A 25 watt lamp is really 100 watt load. The poster does not know what he is talking about. A very dangerous suggestion.
But, then again, he IS an electronics expert.
Latching relays with memory have a little brain inside that remembers the last position and when you turn them on again, the little brain wakes up and looks at the position and says: "Yes, that's correct."
That's why you pay a fortune for them.
I did this for my INFINITY BUG. It suppressed the first 3 rings so the caller could ring back in exactly 40 seconds and the phone would get picked up by the bug so the caller could listen to what was happening in the room.
Get a 10watt resistor. Glue your heatsink onto the top of the resistor and increase the size of the heatsink until you feel the heatsink and say "that's just right."
I did a 6 year university degree to arrive at this solution. It cost me just $65,000. Great value !!!!
You need to start to get organised and have a number of people supply you with old oils. You can then see how to refine the oil by looking on the web. Simple refining and filtering is good enough for oil fired heaters and for diesel motors you need a little bit of "fiddling around."
I still use the very first PCB CAD program created by two engineers in Tasmania.
It does everything you need and has never fallen over or created frustration. All these other program "drive you up the wall" with limitations and "grouping" and "can't do this."
A 100mm x 100mm panel is only...
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