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  1. KrisBlueNZ

    Adding aux input to Sony PMC-202 stereo system

    That's fine. You're not annoying! I think connecting into the cassette circuit is a bad idea. And a microphone preamp won't help. Yes, see if you can get a friend to help. The caps could just be mounted to the socket, with the other end connected to the wires going to the board. Or when you...
  2. KrisBlueNZ

    Panasonic Home Cinema... No Power UP

    Hi Jonny and welcome to Electronics Point :-) Those parts are non-isolated switching converter ICs. C0DAAYH00001, IC2903, takes +18V and produces +5.3V. C0DAAYG00001, IC2900, takes +18V and produces +9V. If those are really the faulty components, which remains to be seen, they are probably...
  3. KrisBlueNZ

    decoder for 8051

    So you want to be able to specify either register, memory, or immediate data. Have a look at how it's done in existing processors. Most processors don't encode every instruction in a single instruction word; they usually have some instructions that take two or three words. If you want to encode...
  4. KrisBlueNZ

    Dishwasher power switch

    Yeah, they look very similar. The eBay one doesn't have spade lugs for the wires though, so you would have to cut the spade connectors off the wires, strip the wires, and solder them to the new switch. Do that one wire at a time - you don't want to get them wrong! And obviously unplug the...
  5. KrisBlueNZ

    Graphical LCDs: alternatives and drivers

    No, it really isn't :) OK. I don't think that will be an issue - the backlight will be ON constantly. Yeah, that would be nice. Or white. Yellow backlight looks very 90s. Right... What would you suggest instead? TFT? Are TFT displays available in monochrome? Colour is really unnecessary...
  6. KrisBlueNZ

    Transformers and Dimmers

    Lewd? Who strips? Where? I guess that's what Steve meant. Either adjustable constant current or PWM.
  7. KrisBlueNZ

    decoder for 8051

    There are a few problems there. You only have five instructions: nop, load, add, sub, and store. You only need THREE bits for the opcode, not six - three bits gives EIGHT combinations. Why would you have 5 bits to specify the source and 6 for the destination? They would normally be the same...
  8. KrisBlueNZ

    Adding aux input to Sony PMC-202 stereo system

    Oh. Could you desolder and lift one end of R141 and R241? It sounds like the whole project may be difficult. The tags on the socket are pretty small. The signal at the tape head is at a very low level, and quite low impedance. You would need to attenuate the computer signal using resistors...
  9. KrisBlueNZ

    Dishwasher power switch

    Hi Dan and welcome to Electronics Point :-) Can you post one or two photos of your original switch?
  10. KrisBlueNZ

    Graphical LCDs: alternatives and drivers

    Hi all, I've taken on a design project that will need a monochrome graphical LCD, and I've never worked with LCDs before, so I would appreciate any advice! The application is a small display unit to be permanently mounted in a special-purpose slow-moving vehicle, to display information to the...
  11. KrisBlueNZ

    Placement of batteries (button cells) in the same plane on two sides of PCB

    I don't see any problems either, apart from difficulty accessing the cells to replace them.
  12. KrisBlueNZ

    Sine Wave from Square wave

    How about answering some questions first. Will the frequency of your square wave be variable? What is the frequency range? How quickly will the frequency change? Can you tolerate some distortion while the filter settles to a new frequency? What is your budget?
  13. KrisBlueNZ

    Project at my lab(EE student)

    Your teacher would not give you this assignment unless he thinks he has taught you enough that you can do it. If you can't understand your teacher, you have bigger problems than being stuck on this assignment! You need to talk to your student advisor, head of department, or whoever. There is no...
  14. KrisBlueNZ

    Quick Server Move

    Seems about the same to me Ian. Possibly a little bit faster than before.
  15. KrisBlueNZ

    DC float switch controlling a 110v ac pump

    Hi there and welcome to Electronics Point :) Your simplest option is a relay. This is an electromechanical device that is activated by a low DC voltage (12V and 24V are common) and can switch a circuit with higher voltage and current. Here's the general arrangement. Your 110VAC comes in at...
  16. KrisBlueNZ

    I need to locate a millisecond delay timer / multi circuit /relay

    You don't happen to have an old laptop with a built-in parallel port do you? The female 25-pin D-sub connector type? I could knock up a small MS-DOS app that you could put on a bootable floppy or CD-ROM (or if the laptop boots MS-DOS, even better) that would take input and generate outputs on...
  17. KrisBlueNZ

    Stage Line 500W amp repair project

    Pete, sorry I didn't reply soon enough! Now you screen shot doesn't show up so I can't check it! That's great that you've been doing your own "research":-) You're going to check the resistors in the output stage before you install the new semiconductors, right? I suggest you install...
  18. KrisBlueNZ

    Adding aux input to Sony PMC-202 stereo system

    As Steve says, cutting tracks is not a big deal, but you can avoid that if you lift one end of R141 and R241. Then you can connect your four jack socket signal connections to the lifted ends of those resistors, and the holes you lifted them out from. You can attach the resistors directly to the...
  19. KrisBlueNZ

    recording computers

    Sounds like you need to discuss your requirements with the IT guys, not us!
  20. KrisBlueNZ

    Switch Project Help

    Only some way to remember which direction it needs to go in. That box runs a single cycle each time it's activated; this one needs a reversible motor and some kind of memory (maybe just a relay).
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