Recent content by esp1

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    Channel Selector??

    hi todd, As you are aware there are lots of A/V channel selectors/scanners available. Depending how far away from the scanner you want the remote push button to be, you can attach extension wires to the switch inside the scanner.  Add a low value resistor in series with high side of the button...
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    cannot download rapidshare files?

    hi, Double left mouse click on a link, [as shown in your thread] You will see a list of three file addresses, click the one you want. Their page will say 'if want to download' scroll down. you will a grey button marked 'FREE', click that. Then you select a radio button, thats the little...
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    laser

    hi rotclues, A laser powerful enough to cut thru cardboard is far too dangerous for home project. I would recommend that you download and study the potential hazards from ANY laser device. Why do want to cut thru cardboard with a laser?? ::)
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    motion sensor power supply problem

    hi, The large blue capacitor is connected to the 'line' [phase] of the incoming mains supply. The design uses the capacitive reactance of the cap to limit the current flowing that low value/hi-watt resistor. You can work out the current flowing in the resistor, by using Xc= 1/ (2 *pi *  Freq *...
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    Fusible resistor

    The 2 boards that are blowing fuses, have you done a resistance check on the output pins. I sounds as though you have short on the boards, especially as they blow with no battery connected. Do you have a circuit you can post, it will make it easier to suggest a repair. Are the 3.6 Vbty  for...
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    Fusible resistor

    Hi, If its blowing the bridge rectifier, the problems not with the fuse link.    I would suspect you have a short on the output of the charger. Have you tested across the output terminals with a ohms meter. [ WITH THE MAINS POWER DISCONNECTED] ??? Also, does it blow fuses when no battery is...
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    Fusible resistor

    hi, I would not normally fit a fusible resistor in a battery charger, a standard, slow blow fuse would be OK. If its a typical battery charger I would expect a 5 or 10Amp fuse would be OK. Does the battery charger have a current meter?? >> relation between the  peak primary current...
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    parallel port not working

    hi pier, If you have a spare slot in your PC, you could get anotheer Parallel port pcb fairly cheap, use LPT2. Can you try connecting YOUR printer to a friends PC for a test and vice versa?
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    Fusible resistor

    hi, Your question is like asking what size fuse shall I use?? Its not possible to suggest a 'fusible link' without knowing more of the application. If possible, post a drawing of the circuit you want to protect.
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    controlling 220v

    hi euro, You could consider using say, HEF4013 dual 'D' type flip/flop.[ with a transistor to drive the relay] Positive pulse ON/OFF, they also have a RESET pin. Use a simple R/C on the RESET pin in case of a mains blackout. Your 4011, could restart in any state.
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    controlling 220v

    hi euro, You could easily construct a logic circuit using a couple of transistors and a standard relay. The relay would work like a bistable type. With the low current required for the transistor/relay bistable, you could have the transistor bistables in a central control box, driving the...
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    controlling 220v

    hi euro, You can buy logic ic bi-stables, not very expensive, the bistable  output would 'latch' the AC module. If you bury electronics, you should use IP68 rated boxes/enclosures, pay special attention to earthing and use a RCCB. Whats the system for?
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    controlling 220v

    hi euro, You can buy small encapsulated solid state modules for AC control. There are different types that can switch from 2 Amps thru 10A at mains voltages. They are fully isolated and rated for mains voltages. The control voltage is Vdc from +3V thru +24Vdc, with a very small control current...
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    how to repair bios

    Hi, Have a look at this, ref: bootstrap loader program. http://en.wikipedia.org/wiki/Booting
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    switching 12Vdc with 3Vdc

    hi, Most general purpose relays will handle 12Vdc 1amp, just check the relays spec sheet, dont forget to specific the relay coil operating voltage to suit 12Vdc. What components do you have on the shelf? Dont know where you are posting from, so cant suggest a local source!
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