Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Register Log in
  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by laroche73

  1. L

    building a better mouse trap

    mixer or bridge? Thanks for the suggestion, Nigel (why didn't I think of that first...?). any suggestions for a mixer IC? I seem to recall some analog PLLs (565?) use a doubly balanced mixer in the frequency/phase comparison stage. BTW, I got the idea for using some sort of bridge from the...
  2. L

    building a better mouse trap

    Hi folks, I'm looking for some suggestions for a simple circuit to compare the resonant frequency of a crystal (10 - 20 Mhz) with that of a LC circuit. The LC is tuned by laser trimming a capacitor bank on an ASIC, and the whole process is currently based on a rather complex DDS system...
  3. L

    cutting PCB's

    cutting PCBs I've had good luck using the method described in the first response by WilliB. A dremel or the cheaper Craftsman equivalent along with a dremel drill press (~ $40 US) will give you very precise cuts. What I do is set the dremel cutting wheel height, then slowly slide the PCB along...
  4. L

    D filp - Flop

    Yes, as long as the "D" & "CLK" inputs are held at static levels. Be aware of the difference between asynchronous and synchronous "Clear" and "Preset" inputs. As the terms imply, synchronous inputs only affect the Flip-Flops' output on the appropriate clock edge, whereas asynchronous inputs are...
  5. L

    recorded voice player

    diy Why not, the handle's insulated with a 1/4" of plastic. I'd be more concerned about lead poisioning than electrical shock. There was a story a few years back about an electrician diagnosed with brain damage after 20+ years in the industry. Turns out he always stripped the insulation off...
  6. L

    Patenting ideas??

    Patent reading (Con) For some further thoughts on patents (strangely similar to chemelecs), have a look at these articles... **broken link removed** https://www.electro-tech-online.com/custompdfs/2005/01/casagpat.pdf https://www.electro-tech-online.com/custompdfs/2005/01/newpats.pdf...
  7. L

    Any easy way to deal with torn out solder pads?

    replacing ruined SMT solder pads You might try using copper foil tape that has a conductive adhesive, like 3M type 1181. It's usually used for EMI shielding, but can be used for making quick and crude hobbyist PC boards or for repairs. Copper tape is widely available, the main obstacles for...
  8. L

    Level Shifting 5V->3.3V

    5V <=> 3V I'm using 0402's and 0201's (a 0.1uF cap in a 0201 footprint is an impressive bit of engineering and hard to find on the floor) and need a skilled technician along with a good microscope. Conductive epoxy and solder paste are useful at those sizes. Another point in this thread...
  9. L

    Avatars

    I just visited the "cold soldering" thread, and have to say Pike and Noggin win the avatar competition.
  10. L

    Wirebonding question

    wirebonding Au-Ag Yes, thank you. I ran across it yesterday, and found it to be one of the more helpful documents in the limited information available on the net. A few key statements from the paper confirmed this is not a common procedure (yet). "While this work provided data that shows...
  11. L

    Wirebonding question

    Has anyone successfully used gold wire to wirebond to an immersion silver PCB surface finish? I'd like to know of anyones experience with this or any long-term issues with current immersion silver finishes (MacDermid "Sterling" for ex.)? The reason I'm asking is that a PCB I'm working on needs...
  12. L

    Build logic analyzer

    logic analyzer here are a few links that may help https://www.electro-tech-online.com/threads/cable-modem.9856/ https://www.xs4all.nl/~jwasys/old/diy2.html (haven't tried this one yet)
  13. L

    555 timer Monostable mode

    false triggering 555 monostable Also take a look at this thread [url]https://www.electro-tech-online.com/threads/interrupt.5395/
  14. L

    Reading from SDRAM

    SDRAM datasheet **broken link removed** assume you meant 128 MB module, in the 168-pin format?
  15. L

    CURVE TRACER SCHEMA !!

    Curve tracer Nigel's right, but here's a simple curve tracer you can build to satisfy your curiousity. I also have an old National Semiconductor App note ('77) that describes a curve tracer circuit based on a quad op-amp. Its intended use is for checking out JFET characteristics. If you're...
See more

Latest threads

New Articles From Microcontroller Tips

Back
Top