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  1. B

    Pin 7 of 555 timer doesn't discharge

    The other thing to watch is that your trigger time on pin 2 is less than your overall time.
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    Homemade PCBs with a Brother printer - 4mil Traces

    mmm..ok. I use the blue press-n-peel normally but I'll give this a try as it is a much cheaper alternative. Thanks for the link.
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    Homemade PCBs with a Brother printer - 4mil Traces

    Brother laser toner usually does not work with toner transfer as it is not re-fusable. i.e. it is made to melt correctly just the one time. I must have tried it 20 times or more with no consistant acceptable result. Since going over to the HP mono laser printer and even with the el-cheapo...
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    Op-amp task

    No one is going to tell you outright but a tip is... .............where is the voltage located? have a good look.
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    Powering a 12v monitor with what battery?

    Rubbish. There are many discharge items in a car that draw small amounts of current when not charging. Radio, cd player, clock, parking lights etc.etc. A lead acid battery can sustain discharge down to a terminal voltage of approx. 10V6 before requiring a recharge. If you are worried you may not...
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    Powering a 12v monitor with what battery?

    Perhaps you could enlighten my many years experience on just why that might be.
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    Powering a 12v monitor with what battery?

    More detail on the monitor would be helpful. Cannot see any problem running off a car battery but that depends on the detail. If the car battery went unused for months, it would need to be trickle charged/maintained.
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    wiring a 4 wire ac condensor fan

    Not a good idea at all to try to run it either at 120v OR in the wrong configuration. Can you give us a better pic (straight on ) of the circuit diagram on the motor. o_O Hard to see from here.:)
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    hardware learning

    In my experience, theory was the requirement for design. You could look at places like Talking Electronics but it is more theory with practical building circuits if the latter is what you mean you need.
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    wiring a 4 wire ac condensor fan

    It's a 240v ac cap start/run induction motor which cannot be run from a dimmer to control speed. Neither can it be controlled from a 3 pos sw without that sw being part of a variable frequency drive. It is possible that it may be wound as a 2, 4 or 6 pole giving speed control via switching the...
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    Heating Jacket controlled by Arduino for Winter

    Heaters do not create degrees centigrade. They do generate heat in watts which will be absorbed by the surroundings. At present with 3v and 1.5amp you will get approx. 4.5w. As a comparison, a standard bathroom heater will have 2 or maybe 4 heat lamps at 275w each.
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    Partially shaded solar panels

    . Correct......even the shadow from a wc vent pipe will have a similar effect.
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    Reduce Voltage to Zero in Part of a Parallel Circuit

    Should already be zero. Black wire creates dead short across green and blue.
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    Toggle Switch for Momentary Function

    Seems to me that a momentry toggle switch is what you are describing. If you need it to operate "up AND down" momentry then a double throw momentry action with the outputs joined together.
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    help with power consumption.

    One can buy plug-in meters for maybe $30..... One type is called cent-a-meter I think. Can be used to give cost as well. Try plug in power consumption meter Ebay...
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    Electric motor to turn a fishing reel

    As there is no need for exact positioning I would forget that idea and go with the brushed dc motor originally suggested by Minder. More torque as well.
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    Laminator for PCB's ?

    Actually I do but rarely admit it. Have to keep it hidden from the safety mob. They seem to have little knowledge of "required special tools"
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    Playing with valves

    Steve, Don't know if you make them because you can but there are some listed in Ebay here in Aus..... various types .... http://www.ebay.com.au/itm/5-x-MINIATURE-VALVE-TUBE-SOCKET-7-PIN-PCB-9-PIN-PCB-7-PIN-CHASSIS-MOUNT-/351766626327?var=&hash=item51e6ecc017:m:mMkTeHuH-KfGdmf8I-eMbYA
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    Laminator for PCB's ?

    Well done. Any further info on the unit? Sorry but have to ...someone will....what's with the single insulation on the mains flex?:eek:
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    Problem reading frequency using arduino on pin f5

    There would be 2 parts to this design, the program being just as important I would imagine.
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