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  1. K

    Capacitor Swap

    Can you post a schematic?
  2. K

    I need a relay HJR-3FF-S-Z 24v coil

    Hey folks. Another one of my recently broken items is my Staples shredder, which has stopped working in the forward direction. I've done my troubleshooting and determined the cause to be a faulty relay. The relay is a Tianbo HJR-3FF-S-Z sealed 24V coil SPDT relay with 10A contacts. Datasheet...
  3. K

    Ground control to major tom

    Correct. It's a concept as much as it's a tangible thing. Another place where "ground" is used is in vehicles, where the metal body of the vehicle is (usually) connected to the negative terminal of the battery/electrical system and acts as the return path for all the circuits, greatly reducing...
  4. K

    What is this switch type? It’s driving me crazy!

    It's likely a rotary encoder. It is implemented as 2 switches that close momentarily out of phase with each other. The direction of rotation is detected by which switch closes/opens first. Does the knob turn continuously (endless) or does it stop at the extremes? If it stops at the extremes...
  5. K

    Ground control to major tom

    In electronics, "ground" is the 0V reference that other voltages are relative to. In many cases, it's the negative rail of the power supply or the negative terminal of the battery. For circuits with more than one power rail, the "ground" or common or 0V rail is the common "ground" that the...
  6. K

    Name them Parts

    #1 looks like an encoder or joystick of some sort. #4 is probably a relay. How many pins are on the bottom and how are they spaced? Are you able to get a better pic of the numbers printed on it? #5 is either a piezo transducer (mini speaker) or a buzzer.
  7. K

    Epson Artisan 835 power issue

    Hi folks... haven't posted here in years, but I'm attempting to troubleshoot my Epson Artisan 835 all in one printer. It's about 10 years old so it's served me well. Today I printed a couple pages, then after it finished and it went into its cleaning/parking cycle it started powering itself...
  8. K

    Super capacitor phone battery

    Electrolytic capacitors have a finite lifespan, since they can dry out over time. This is why vintage electronics often need to be recapped during a restoration. In more recent years, with the "manufacture as cheaply as possible" mentality, many devices have cheap capacitors (often from China)...
  9. K

    Breadboard Wiring

    In a breadboard such as yours, each horizontal row (of 5 holes) are connected together. So, row 1, a-e are connected together, and f-j are connected together. Same for row 2, and all the remaining rows. So, when placing components, you have to connect the leads to different rows, or across...
  10. K

    Voltage Follower Doesn't Work

    Just to clarify on the ground thing: a ground in an electronic circuit is the reference point that all other voltages in the circuit are measured relative to. It doesn't mean it has to be connected to an earth ground. Most circuits that use a single power supply and all voltages are positive...
  11. K

    Akai AX-60 Keyboard repair

    Sounds like your synth has some dead voices. Is it 2 keys work, 4 don't, 2 do, etc? Many synths of that vintage used a round robin voice allocation scheme, so each note you strike is allocated to the next voice in sequence. Since the AX60 has 6 voices, if 4 are dead, you would experience the...
  12. K

    Connecting 2 different grounds related to 2 different voltage levels

    Can you post a schematic? Where is your 5V and 24V DC coming from?
  13. K

    mosfet diode

    Seems we've veered well off the original topic... :) hevans1944, I think you should build a project that uses that Burroughs beam-switching decade counter tube. :) Back on the original topic, since the integral diode of a MOSFET is part of the body that comprises the source and drain where...
  14. K

    How to control AC current flowing through a transistor with a Arduino Microcontroller?

    What type of lights are you trying to control? Incandescent? Compact fluorescent? LED? Miniature lights or regular bulbs? Do you need them to dim or just go on/off?
  15. K

    VB or C# ?

    VB.NET and C# are basically just different "skins" on a common framework. Almost anything you can do in one can be done just as efficiently in the other. It's just a matter of which syntax you're most comfortable with. VB is easier to learn since it's more English-like, while C# is more...
  16. K

    Simple Water Sensor - Alarm when removed from water

    With the flat side facing you and the pins down, the pins from left to right are drain, gate, source according to the datasheet (I had to consult several datasheets from several manufacturers before I found one that actually had this info!) On your schematic, the gate is the long flat part you...
  17. K

    74HC14 Schmitt Trigger

    If it's a production circuit that is stable (not undergoing revisions), you could tie the unused inputs directly to ground. But if it's a prototype, using a resistor (or a jumper) makes it possible to remove it if you need to use one of the unused gates in the future, instead of having to cut...
  18. K

    Heath Zenith vs. Heathkit

    According to Wikipedia, Zenith bought Heath in 1979 and it became Heath/Zenith. Heathkit was the name used for their products sold as kits, while Heath-Zenith were/are preassembled products. When they stopped selling kits in 1992, they mainly sold lighting/doorbell type devices under the...
  19. K

    Are there any dangers associated with ceramic coated reptile heating bulbs?

    Those things produce more heat than light, they won't harm your eyes, any more than staring at a glowing electric stove burner will.
  20. K

    8x8x8 led cube

    So it didn't come with instructions or a schematic? How do they expect people to know how to build it then? Even a parts list that shows what C1, C2, etc. are so you can match them up with the actual components would be better than nothing. Guess they expect people to have ESP in order to...
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