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  1. B

    Schematic diagram for DT-9205B Digital Multimeter

    One here for a DT-9025A ...might be a bit different.
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    Visible light

    Don't know about anyone else but I still have to use a multimeter to check dc. Looked at a lot of pcb's and never seen electricity yet.
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    555 timer output clipped

    What loading do you have? A circuit diagram would also be helpful.
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    Power Electronic Keyboard with 12v Car Battery

    Should be ok, just watch you have correct polarity. Check with multimeter before plugging in would be a wise move.
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    Discharging laptop batteries

    If lithium-ion, no memory according to the batteryuniversity site. Working the battery initially probably has something to do with the state of charge when they are supplied and shipped, the latter making some sense given their sometimes volatile nature. I have used quite a few which initially...
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    MPPT for truck, alternator/solar

    The aforementioned diodes were to isolate incoming charge controllers, not to give any discharge protection. As debe says if you need that then you have to follow his direction. However the range of discharge would tend to be rather small given a cutout of 13v. Nothing is going to boost the...
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    Public Signaling

    For 433mhz these seem to work ok. https://www.ebay.com.au/itm/1CH-Relay-Long-Diatance-12V-RF-Remote-Control-Switch-Receiver-Module-Transmitter/263249282413?hash=item3d4ae1456d:m:mzKwQ-TcSX_7K_1jt9EVwwQ variety of modes so you could press for activate and press again for reset.
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    MPPT for truck, alternator/solar

    Fairly standard to have 13.8v on 12v system alternator output. As far as the extra diode on the alternator, I don't really see the need for it. There is no external diode on a standard alternator install and it remains connected to the battery during engine shutdown with no ill effect.
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    MPPT for truck, alternator/solar

    Just watch that your alternator has some form of regulator. Some are external ( usually older units) and later models have it internal.
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    MPPT for truck, alternator/solar

    Solar controller is a separate unit. Vehicle alternators regulate their own output. 2 panels @100w for at best 5-6 hours a day is 1-1.2kw.(at best) Is that enough for your daily use? You've listed quite a few loads but no data on current draw so we have no idea of total loading or voltage (...
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    Timer circuit

    I remember using an addition to the 555 circuit to give the same time at startup but will have to find it.
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    Panasonic blu-ray dvd assistance req'd

    Schematics arrived a few hours later and I'll take it from there for the time being. Be back if I get stumped. Cheers Jorgo
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    Panasonic blu-ray dvd assistance req'd

    No idea really Steve. Brother went away and when he returned, shoved in a dvd of his holiday and nothing. I suspect maybe the MIP2F2 controller or the diode went bad or maybe even the electrolytic caps I removed. Was a rather wide spread bit of damage really. Just found some bloke in the...
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    Panasonic blu-ray dvd assistance req'd

    I have my brother's Panasonic blu-ray dvd player here with a variety of faults, most of which I seem to have overcome. Model is SA-BT207. When first opened, it had an obvious power supply fault, couple of high voltage caps (820uf 400v and 6.8uf 400v) were bulged and leaking, the main input...
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    Old School House Wiring

    Butyl rubber insulation but as in previous post, weave could be asbestos. These days most countries have facility for testing @ maybe $40. Sample is placed in a tough plastic bag and results come back about a week later. I have doubts on the effectiveness of a paper mask also. This can be...
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    elvi motor help

    Could be a hall effect or an opto.
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    elvi motor help

    Elvi seem to specialise in dc motors. If it has permanent magnets it will be dc.
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    How do I wire a BMP085 Barometric Pressure Sensor?

    You will quickly learn that in electronics there are no shortcuts if you want to educate yourself. Promini pinout attached. A4 .....SDA A5 ..... SCL
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    How do I wire a BMP085 Barometric Pressure Sensor?

    First bit of the link says" i2c"
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    Some info I read re UV exposure resist undercutting, with questions..

    With reference to long etching time resulting in undercut, some of the older board (not coated) seemed to have a thicker copper layer than ones I bought recently.
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