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  1. FuZZ1L0G1C

    Identifying an unknown potentiometer

    FuZZ1L0G1C submitted a new resource: Identifying an unknown potentiometer - How to test when printing is worn off, or not sure if Log or Linear taper Read more about this resource...
  2. FuZZ1L0G1C

    Speeding up and re-using Ferric Chloride etchant tips:

    As a long term ferric chloride user, I came across this interesting 'Instructables' article, so decided to try it out. It definitely makes a improvement to the etching time, with the downside being that the user is working with dangerous corrosive acid (Muriatic, aka Hydrochloric acid), as in...
  3. FuZZ1L0G1C

    What solid state components can switch composite video (AV)?

    Our TV is quite an old model, an LG Golden-Eye CRT. This has 2 AV inputs, one doesn't work, so let's say one AV(1) in. One AV out. Has RF ANT in / out. The DSD is AV out, currently to TV's AV1 in. The DVD/FM uses AV out (for DVD movies). A VCR can use AV in/out or RF in/out. The PVR is AV...
  4. FuZZ1L0G1C

    DEFY magnetron - stuck with removal?

    Hi. Yesterday, my DEFY microwave oven model DMO367 MWM 2030W fried its magnetron, and the silver-coated waveguide cover that clips into the cavity inlet slot. Beautiful orange corona discharge through the w/g cover, melodious 50 Hz arcing heard, pleasant aroma of burnt ceramic. The micros I've...
  5. FuZZ1L0G1C

    Tips on tracing complex PCB circuits:

    Nothing is more frustrating than spending an hour or so tracing both sides of a double-sided PCB, drawing it or noting routes on paper, only to find that somewhere, you mistakenly traced a different track when flipping the board. A lightbox below the PCB can assist in seeing the opposite side's...
  6. FuZZ1L0G1C

    Winding own coils? Calculators / Formulas / Theory.

    For those interested in designing / winding their own coils, here are some (hopefully) interesting links. The articles include formulas, theory, and design considerations. A number of them have internal links to different coil types (planar, helical, etc). Some are simply on-line calculators...
  7. FuZZ1L0G1C

    Is this part of a GPS antenna?

    While a Garmin Nuvi was open on the workbench, (for loudspeaker mod), noticed a device I have never seen before. At the top of the board, coming from the shielded RF section, there is a short trace which connects to the (arrowed) rectangular block of yellow translucent (plastic?). The other end...
  8. FuZZ1L0G1C

    Add line out to speaker-damaged Garmin GPS?

    Howdy y'all. My Garmin Nuvi GPS was caught in a heavy rainstorm several weeks ago. I opened it to dry everything for 24h atop an oil heater (low heat). All GPS functions still work, except the small loudspeaker, which is now barely audible. I think it's the speaker, as I plugged a temporary...
  9. FuZZ1L0G1C

    TeraWave Technology Web-Research Results, tables and supercomputers

    Some web reading related to the topic of highest frequency generation, which users may find interesting - Arranged in (roughly) alpabetical order of subject title: https://www.britannica.com/science/electromagnetic-spectrum https://www.theiet.org/resources/inspec/support/subject-guides/gan.cfm...
  10. FuZZ1L0G1C

    Are cross-referencing answers to own posts allowed?

    Hi moderators. Some forums frown upon "self-promoting", or suggesting that a question-poster visit / view the answerer's related contribution on another forum (but still same website). Is this OK to do on EP, in certain cases? More specifically, a poster has requested help with building an audio...
  11. FuZZ1L0G1C

    Low-drain Long-life audio clicker

    FuZZ1L0G1C submitted a new Project Log: Low-drain Long-life audio clicker Read more about this project log here...
  12. FuZZ1L0G1C

    Some info I read re UV exposure resist undercutting, with questions..

    Hi. I've been doing a lot of web research lately, regarding the best method of creating clear, sharp PCB traces at fine resolution. Currently, I have no sophisticated UV equipment or materials, which is why I'm researching what to get. My current modus operandi is the old-fashioned and clumsy...
  13. FuZZ1L0G1C

    Too many printers - not enough ports?

    Hi all. I've just invested in a new hi-res color inkjet printer, which now makes a total of 2 lasers and one inkjet. However, the (Gigabyte) motherboard only has 4 ports, 3 already in use, the fourth used for my printer. The printers each have their unique advantages, so if possible, I want to...
  14. FuZZ1L0G1C

    {computer}: How to add a monostable to PC PWR/Reset button?

    Hi all at EP. Foreword: I'm planning to design a "System Ready" beeper for my PC at home. The reason is that it takes a frustrating 6-7 minutes from power-up to boot, load OS and do AV & Sys checks. After about 7 minutes maximum the activity drops to normal. Instead of waiting at the PC an...
  15. FuZZ1L0G1C

    Purpose of end loop on FM wire antenna?

    Hi. On my hi-fi, I have the standard 'T' shape folded dipole antenna, which uses a smaller version of coax plug. On other receivers, I've seen just a simple single-wire extending from the set. However, while shopping recently, I noticed that several Hi-Fi's use a new FM antenna design - a single...
  16. FuZZ1L0G1C

    Teaching myself LTSpice-XVII & Diptrace....

  17. FuZZ1L0G1C

    How to minimize acoustic mike<loudspeaker feedback?

    To prevent howl, would delaying the signal-path help? Low volume or headphones helps, but play guitar "live" and problem of feedback surfaces. An idea I had is to use a passive analog delay-line in the input circuit. I have a circuit for this, somewhere... Hopefully this would decrease the...
  18. FuZZ1L0G1C

    Building MIDI-Keyboard scanner - circuit layout and lag?

    Hi. Planning to construct a keyboard scanner / controller (1): The decoupling caps all appear to be in parallel (pin 16 Vs to Gnd), so does each IC see 2uF (20 x 0.1uF)? (2): On 16 of the IC's it shows Vs connected to pin 16 and pin 6. Where should the 0.1uF 16V mini-disc caps be physically...
  19. FuZZ1L0G1C

    Web-tech multiple questions: Graphics Dims, DPI, GIF & Video

    Hi EP forum members. Even though I’ve used various forums for some time, I’m still fairly green when it comes to certain specifics. I read that 200 Kb is the maximum byte-limit for uploading images to Electronics Point. This is easy enough to do by resizing and XY dimensions and / or...
  20. FuZZ1L0G1C

    Technics turntable's stylus specs required

    Hi all. I've been given a TECHNICS SL-BD20-KXA5 DC Servo Automatic Turntable System for repair and own use (to digitize my LP vinyls). Problem is: the owner attempted self-repair and possibly damaged stylus. Stylus is EPS 24CS, the orange clip-on shell as in photo. Damage was due to no...
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