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  1. AnalogKid

    A couple questions

    You were ok up to this point, but storing a string of 6-digit numbers means a memory array of some kind. For small projects that usually means a PIC, AVR, Arduino, or some other small microcontroller (uC). What is your skill set with programmable devices? ak
  2. AnalogKid

    Gear VR Internal Connectors

    Domestically, I would guess Samtec, Molex, maybe 3M... But there are many "standard" connectors in Asia that are not available through distribution here. JST and Foxxcon have tons. ak
  3. AnalogKid

    Do you know where to find this case and design?

    With the possible exception of the white rectangular box with the shorter antenna, that is all fully custom packaging. With those antennae lengths and orientation, it looks fake to me. ak
  4. AnalogKid

    Help with old GE boombox

    One possibility is that the unit is assembled in the box formed by the front and sides, then the back goes on as a relatively thin piece. To be sure, need high res photos of the back and sides. It is common in consumer electronics today for each of the screws that must be removed to...
  5. AnalogKid

    Help with Schematic?

    What is the intent of the project? This looks like a temperature detector - when the thermistor temperature is above a certain setpoint, the LED comes on. If that is the idea, the the LM324 (actually, 1/4 of an LM324) is not the best part for the job. Its output stage cannot go all the way up...
  6. AnalogKid

    Transistor-triggered photogate

    Dumb response. You asked the same question three times, and got different variations of the same *correct* response three times. Obviously you don't like the answer because it does not fit your simplistic view of the problem, but why do you think someone else will say anything different? ak
  7. AnalogKid

    Transistor-triggered photogate

    No, it isn't. Your basic concept of how a photographic strobe works is incorrect because it is incomplete. As has been suggested twice, look up photo flash, strobe, and flash gun circuits. You will see that you also need a trigger transformer. That is the thing that is driven by the signal...
  8. AnalogKid

    eprom studys...

    Your circuit cannot be diagnosed from your photo - or from *any* photo. Please post your schematic. Without it, we could go through 50 posts and get nowhere. ak
  9. AnalogKid

    LED or CFL flickering with motion sensor in circuit

    Dimmer heating made my wife nervous until I pointed out that the front plate is the heatsink and is working to eject the heat, the components inside are rated for way higher temperatures, and the wall box is completely fireproof by law. ak
  10. AnalogKid

    eprom studys...

    An EPROM is a memory array, not a controller. Like any memory device, there are a number of bits grouped at each memory address location. Your devices has 65,536 locations, and 1 byte (8 bits in parallel) of data at each location. A combination of chip enables, output enables, and strobes...
  11. AnalogKid

    LED or CFL flickering with motion sensor in circuit

    I strongly disagree with this suggestion. A wall box does not have many open holes because its primary job is to contain fires. I doubt there is enough room inside to add a bulb behind the sensor/switch, but if there were the bulb would fry the sensor electronics in under an hour. Demo: Plug...
  12. AnalogKid

    I Want To Make A Device That Tells Me That Electricity Is Back

    In the blackout alarm schematic, to me it looks like the beeper is on continuously when power is good. With VR1 at its minimum value, there still will be Vcc/2 across the Q1 base-emitter junction plus D1. So for any Vcc above about 3 V, Q1 will be on. Also, D2 in series with C2 doesn't make...
  13. AnalogKid

    I Want To Make A Device That Tells Me That Electricity Is Back

    CD40106 driving a piezo beeper?
  14. AnalogKid

    I Want To Make A Device That Tells Me That Electricity Is Back

    That works only if the radio is plugged into an outlet that is *not* powered by the backup generator. ak
  15. AnalogKid

    Anyone know what this is?

    I commend your excellent schematic skills. Very refreshing. ak
  16. AnalogKid

    Beginner needing help - Simple timer circuit for reversing 5v motor

  17. AnalogKid

    Call or Signal Box for Warehouse

    Voltage drop calculations are based on the supply *voltage* and the load device *current*. 1. Add up all of the load currents, and get a supply with at least 50% more output current than that. Example - for a 3 A total load, a 4 A supply is too little margin, but a 5 A supply should run...
  18. AnalogKid

    Call or Signal Box for Warehouse

    Works for me. ak
  19. AnalogKid

    Call or Signal Box for Warehouse

    Not only is a relay latching itself is older than Ed, it's even older than me. The classics never go out of style. UL 1950, now EN60950, has rules about safe voltages, called SELV (Safe Extra Low Voltage). It is something like 32 Vac and 42 Vdc. Ish. I recommend 24 Vdc for the entire...
  20. AnalogKid

    Beginner needing help - Simple timer circuit for reversing 5v motor

    Just to be clear, absolutely no wiring of any kind between/among the motors? ak
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