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  1. B

    Homemade light-bar (LED query)

    Individual units are probably the best approach. You may find it quickly get out of hand, cost wise and in practical terms to do otherwise. https://www.stratusleds.com/100w-led-driver/
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    Solar powered fan

    mmmmmmm....my suspicions were correct.:rolleyes:
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    Stuck with fixing SZBJ DT9205a multimeter selector mechanism

    Deja vous....$10 meter.
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    Amplifier and long distance remote

    Some elcheapo key fob remotes claim up to that distance. Either that or a $40 remote control for aircraft etc. and add a servo or two.
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    Replacing Christmas light bulbs.

    Maybe, maybe not. Depends what each bulb is. At best, you will get maybe 1/6 the light output for the same wattage rating bulb. i.e.a 6v 2.5w bulb replacing a 2.5v 2.5w bulb will only give you around 0.4w Chances are it will probably not light up at all.
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    New to electronics, making wireless door lock

    One can get a varity of channel number output wireless control units from Ebay starting around $8-$10. Differing voltages, with or without cases, ac,dc. Operate via key fob. Too easy.....
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    Solar powered fan

    I'm intrigued just what solar heat collection in a box is all about.
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    12V Light project

    In that case, just connect a 12v plugpack.
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    12V Light project

    Just seems pointless to power it from 5v to 12v and then back again to 5v to drive a couple of usb charge ports. Granted the switch Leds are set up for 12v. So do you intend to drive relays for the outputs(lights)? Be a bit wary of the wiring detail as it seems to be a-up.
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    DC power supply with different V out

    Perhaps these...only a couple of dollars each off Ebay. Use one per voltage output level. Just watch what this "small nichrome heater" current draw actually is. Can get large current quickly at low voltages. Units quoted can handle max around 3A...
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    How do you test a 3-Legged Diode (Rectifier)?

    These are usually a fast diode. Two in the one pack in fact. Yes, aka(anode kathode anode),kak (kathode anode kathode /or cathode)indicates polarity with the centre pin common to both diodes. Test as a regular diode. For info diagram google u1620 and u1620R
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    Raspberry pi with multiple motors.

    Build each device independantly with the final application in mind. Get each working in it's own right and then combine to build the final unit. Plenty of detail out in google land to assist each unit.
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    Driving an electromagnetic passive SMD buzzer

    A lot of questions here, such as why such an abnormal supply? Hardly high enough to drive most micros. Then the device, can you provide full spec sheet? Resistance and rated max current do not appear to allow for any direct connection to supply. Do you have programming skills? If all you need is...
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    Fm transmitter data pins, what are they for?

    Morse code key???
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    Need help testing this circuit

    This is a good example of what happens when circuits are drawn unconventionally. Try connecting the led load to the positive and include a current limiting resistor.
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    Will this charger work?

    Link shows 42v 2a.... Thats why I asked what are the 3 x 12 batteries. "doesnt appear to be working" could cover many possibilities.
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    Will this charger work?

    What are the 3 x 12v batteries?
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    Quickshifter

    It appears that although in some modes the trigger starts the event, it does not appear to be the deciding factor in successive timings. Rather, it appears it needs to be powered down for the trigger to control a one off event again.( be it cyclic or not) Think you need to look at other...
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    Transistor Help

    Can you supply a bit more information like your circuit diagram with values of components, type numbers etc. and just what loading you are trying to control.? Pencil drawn sketch is quite ok.
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    (Please help) Portable solar powered powerbank

    If you believe the supplied is 60% of what is required then I think you may be in for a shock.
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