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  1. AnalogKid

    Gcse project NEED HELP

    Agree, but not surprised. It fits the pattern. ak
  2. AnalogKid

    Simple FM Radio receiver

    If a slope detector has no *de*-emphasis, the audio will sound brighter than it should, not muffled. If it has proper de-emphasis, the audio will sound normal. There is no reason to have pre-emphasis in a receiver; pre-emphasis is a modulator/transmitter function. Slope detection is not...
  3. AnalogKid

    Need help finding power supply

    Lambda is one of the largest power supply manufacturers in the world. That transformer is a fully custom design, prototyped and verified in-house and then shopped out to a low cost, high-volume manufacturer for production. Long story short - you cannot buy a replacement transformer. As above...
  4. AnalogKid

    Exhaust Switch Project HELP!!

    Actually, that is exactly what this thread is. Opinions are all fora have to offer. Here's another opinion - at fewer than six hours enrollment and a whopping three messages, I think you're a bit young to be declaring what is or is not an appropriate response. ak
  5. AnalogKid

    What do you call something...

    Glastic Basically, sheets of fiberglas impregnated with resin, just like FR-4 pc board material. Glastic is both a brand name for a specific company's product line, and a generic name for similar products (like "Kleenex" for tissues). ak
  6. AnalogKid

    Help with strobes!

    If you mean nothing but 555 timers, it will take at least 22 of them, plus other stuff. As above, this can be done with one 555 plus counter IC's better suited to this task. I'm sure it would be. With the information now presented in this thread, why don't you take a stab as a schematic...
  7. AnalogKid

    Help with strobes!

    There are 22 total flashes in one complete cycle, so that is three 4017's, 22 OR-ing diodes, two LED driver MOSFETs, and two gate pull down resistors. One or two unused 4017 output stages could be inserted among the three pattern steps for a small visual break. 22 diodes sound like a lot and...
  8. AnalogKid

    Help with strobes!

    Completely agree, hence my tagline. "I suppose it is tempting, if the only tool you have is a hammer, to treat everything as if it were a nail." - Abraham Maslow, The Psychology of Science: A Reconnaissance, 1966 ak
  9. AnalogKid

    Anyone know what type of resistor this is?

    Agree, 20 ohm, maybe only 1 W. The latest generation wire-wound resistors have higher power ratings in smaller package sizes. How old is it? ak
  10. AnalogKid

    Anyone know what type of resistor this is?

    Looks like 0.2 ohm, 2 W, but it is hard to tell the physical size from your photo. ak
  11. AnalogKid

    Electronic circuits work in mysterious ways?

    Yes. Throughout the 1700's and 1800's, all of the math for electricity and electronics was discovered, worked out, tuned up, etc., all before the invention of the vacuum tube. In the 1890's, Oliver Heavyside overhauled Maxwell's field equations into the form we know today, and that was it for...
  12. AnalogKid

    Operational Amplifier Internal Resistance

    "The circuit laws and properties of opamps" In a linear (non-saturating) circuit, one of the "laws" is that the input impedances at the opamp input ***pins*** is infinite (zero bias current, zero offset voltage). But another law, derived from the feedback equations, is that the "amplifier...
  13. AnalogKid

    Illuminated DPDT Switch

    Part number for switch, link to datasheet, photos ,,,,,,,anything?
  14. AnalogKid

    PirSensor

    Two things. First, the turn-off delay might be programmed into the controlling chip and not adjustable by changing an external resistor or capacitor. Second, the delay might not be a controlled parameter at all. The sensor warms up (accepts radiation) based on the field strength of that...
  15. AnalogKid

    Questions regarding H-bridge

    Or, delete D1-D4 and use the zener diodes already built into the four MOSFETS as shown on the OP schematic. Also, the schematic is missing two connection dots where the diodes join the "motor". To make sure crossed lines are not misinterpreted, don't have any. If D1 and D3 are staggered...
  16. AnalogKid

    Diesel tacho circuit

    Then I think an excellent starting exercise is to redraw the opamp and F/V sections of the schematic using the correct symbols and post it. You will gain a much better understanding of the signals, and we will be much more willing to assist. ak
  17. AnalogKid

    Small print

    For me, magnifying "reader" glasses at most discount stores have enough magnification and are more convenient, freeing both hands. Get the strongest ones they have (usually in the 2.5 to 3.5 diopter range). ak
  18. AnalogKid

    Diesel tacho circuit

    Where did you get this schematic. Not to pile on, but package outlines usually make a schematic worse, not better. A schematic tells the story of the electrical (*not* physical) relationships among the components, signals, and power supplies. Signals flow from left to right, power from top to...
  19. AnalogKid

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

    Select a piezo beeper and post a link to its specs; not a bare piezo disc, but an complete beeper that runs on DC. ak
  20. AnalogKid

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

    How long of a beep? A single beep that trails off like the ding of a doorbell is pretty easy. Single beep or on-off beeping for a period? ak
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