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  1. dave9

    Technics SA-CH550 panel very dim, is it fatal

    Replace this with a clear polycarbonate sheet. Polycarb because easier to machine than acrylic or glass.
  2. dave9

    Technics SA-CH550 panel very dim, is it fatal

    Yeah it's unfortunate when manufacturer use proprietary parts known to fail within the otherwise viable lifespan of a product. Stereos and microwave ovens annoy me in this regard, would rather the display showed less but used LEDs to do so.
  3. dave9

    Using smd solder paste on pc board that no smd on pc board

    1. Read the description carefully and look at the pictures. Solder paste should contain metal solder balls but if the seller is foreign they could use inaccurate language to describe what they're selling. You could link to a product. 2. It can work but will probably take a lot more time and...
  4. dave9

    Soldering audio cables together

    I have had some luck burning insulation off but only if the wire strands were thick enough to not be deformed by the heat, then I took fine sandpaper and cleaned the charred enamel off. However given that (at least in the US) you can get a dollar store pair of headphones for $1 with a complete...
  5. dave9

    Driving a piezo buzzer: resultant tone is noisy. Why?

    Why would you use a 3.7kHz, buzzer, and/or square wave drive if you want an 800Hz "clean tone"? Take a look at the datasheet.
  6. dave9

    My sony handycam CCR-TR5 will playback video but wont record

    Why on earth would you want to use it if it did work? Close to 30 years old, it's ancient, uses TAPE to record in (analog?) SD, big, heavy, etc. I'm sure it was nice for its time but we have moved so much past that today. A typical $50 point and shoot camera that fits in your pants pocket...
  7. dave9

    Laptop problems help

    Someone send some screwdrivers to the Phillipines.
  8. dave9

    Quasar gx36005yq boombox

    You are measuring the output (secondary) of the transformer, not after the rectification stage, correct? Have you measured the resistance of the secondary and/or primary windings? If they are completely open circuit you can be sure one has a problem but a resistance might also come from...
  9. dave9

    Repair WN3100RP WiFi Range Extender

    If it's a voltage regulator then a place you could start is draw a bit of the schematic before and after it. It would have connection to a power rail and output to something, perhaps memory or the network processor. You can look up what voltages those parts use and what pin has the connection...
  10. dave9

    Repair WN3100RP WiFi Range Extender

    I have no idea, but now it looks like 4 pins not 6.
  11. dave9

    Help required with identifying a component

    https://www.digikey.co.uk/product-detail/en/on-semiconductor/S1G/S1GFSCT-ND/965720 http://uk.farnell.com/search?st=S1G Using the dimensions in the linked SMA.PDF below you can measure yours to confirm that it is package size DO-214AC which the first link above is, or "most" on the 2nd link...
  12. dave9

    Repair WN3100RP WiFi Range Extender

    I do not know what value of resistors it needs, but what you have called a capacitor looks more like a 6 pin IC (integrated circuit), possibly a voltage regulator.
  13. dave9

    Too many printers - not enough ports?

    Cheapest way is a hub, which can be found for around $1 delivered on eBay (would not need to be powered, include a PSU for printers), but personally I would think about adding a 4 port USB3 PCIe card, especially if you have USB3 external HDD(s) or flash drives or expect to get some in the future...
  14. dave9

    Help

    ^ True, but with a rectifier it can also charge 24V batteries. :D
  15. dave9

    Trans former rewind

    This... or just buy the right transformer as you live in a 1st world country and it can't be very expensive to buy a 10V, 500mA transformer, or if you need DC from it, put 3 diodes in series after a common, switching 12V/1A AC-DC adapter. What are you powering? I'm drawing a blank for what...
  16. dave9

    Help

    To reproduce the result you had with the old battery charger, it iseems like you just need a sufficient size transformer rated for (110VAC or 220VAC primary side) 24V, enough current (what was the amp rating on the old battery charger?) and a diode rectifier after it, also rated for sufficient...
  17. dave9

    Computer mouse circuit repair

    The problem is that if you couldn't solder that as it were, it is doubtful you will be able to solder the repair of how it is now. I cannot see your pics very well, there is too little color and bad lighting. However from what I "think" I see, the top switch pin just gets soldered to the...
  18. dave9

    Help Identifying blown component

    That's a resistor. I see "R24" but what is the lettering immediately to the right of that? "R" something ? Why did you only post a tiny piece of the schematic? Did you check to see whether the component has an ohm measurement? It might be fried to the point where you want to replace it, but...
  19. dave9

    Total Electronics Novice In Need Of Power Supply Advice

    So long as the PSU you're now using is decent quality and not worn out from years of running hours, there is no reason you can't keep using it indefinitely, unless you need to put it back with the hub to use the hub.
  20. dave9

    125 degree C electrolytics by Su'scon

    ^ ESR higher than optimal may work for a while, hopefully not allowing a damaging (or instability causing) level of ripple, but will tend to fail again much sooner and when a PSU circuit fails there's a chance it damages something. Always use very low ESR caps on the output of a switching PSU...
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