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  1. AnalogKid

    Calculating Resistance With Just Voltages? Basic DC Circuit Design

    Without knowing the operating current of each device, you cannot calculate the resistor values. Separate from that, you approach will not work. None of those devices draws a purely constant current; the load current varies with the actions of the device. Motor startup current can be many...
  2. AnalogKid

    Automatic Blow Off For A Conveyor

    Not exactly a fair comparison because of the tolerances allowed by the two situations. 1 pixel back then was 1 part in 320. The requirement here is over 5 times more stringent. But I get your point. However, the capacitor for a microsecond RC timer can be a 1% polyester film or silvered mica...
  3. AnalogKid

    Automatic Blow Off For A Conveyor

    What power is available for the control circuit? What is the go/no-go signal out of the scale? What are the control signal requirements for the air blow? How fast is the line moving? What is the margin on the timing signal. IOW, 16.56 seconds +/- xx.xx seconds? What is the range of ambient air...
  4. AnalogKid

    Who gets there first!

    I agree with Bob; the race as described would be very short. But if that really is the thing, then a tach sensor on each bike, three level comparators, and a 3-input game show circuit to latch the winner. ak
  5. AnalogKid

    Doubt about it 6-to-64 decoder

    The #1 schematic is backwards from the traditional way of doing a staged address decoder. Usually the low order address bits to to all of the low level output generators, and the higher order address bits go to the pre-selector. #4 shows this. ak
  6. AnalogKid

    Silly regulator question

    That is a classic linear regulator. For a constant input-output voltage differential, the power dissipated in the device is directly proportional to the current. If it was running how at 0.5 A, it probably will be too hot at 1 A without additional heatsink area. ak
  7. AnalogKid

    Silly regulator question

    Without part numbers or a partial schematic it is impossible to say for sure. There are two basic types of voltage regulators, linear and switching. Linear regulator power dissipation is simple: (input voltage - output voltage) x current (14 V - 5 V) x 1 A = 9 W Switching regulators are much...
  8. AnalogKid

    What is this?

    Ed: * * * * ak
  9. AnalogKid

    Newbie, please help

    Do you mean this intercom, or that intercom? ak
  10. AnalogKid

    LED stripe resistor

    Please post a working link to the exact product you are using. Without that, we are just guessing. ak
  11. AnalogKid

    Power-One power supply mod

    I thought you wanted a single 0-30 V rail? ak
  12. AnalogKid

    Power-One power supply mod

    What is it with that schematic? This is the 2nd time today someone has had questions about, two different people on different fora. ak
  13. AnalogKid

    Mains Vpp

    Vpeak is the max voltage anywhere in 1/2 cycle, measured with respect to the waveform centerpoint. Vpeak-to-peak is measured between the max positive value in a positive half-cycle and the max negative value in a negative half-cycle. Vrms is calculated using a full cycle. ak
  14. AnalogKid

    Mains Vpp

    As above, most of it is the difference between peak and peak-to-peak. Some of it might be noise. If the scope has a vertical channel bandwidth limit function, set it to its lowest corner frequency. Get a 0.1 uF, 250 Vac, X, X2, or Y rated capacitor and connect it directly across the...
  15. AnalogKid

    DAC controlled voltage regulator

    Disagree. I think it makes an average fixed current regulator. Since 100% of the output current goes through the adjustment pot, that can put severe restrictions on the type and size of pot used for a adjustable output current. ak
  16. AnalogKid

    Chip Sheet Data

    Communication, computing, industrial controls, medical devices, spacecraft, consumer devices, whatever. TTL broke the link between one area of electronic circuit design and a traditional college degree in Electrical Engineering. Within a defined set of rules, TTL was a lot like LEGO blocks -...
  17. AnalogKid

    Connect several wires without relays?

    Are any of the wires bi-directional, or are some of the source-only and some load-only? Can you post a wiring diagram indicating the signal flows? Can you post any other useful information - size restraints, budget, environment, power sources available for the control circuit - ??? ak
  18. AnalogKid

    Connect several wires without relays?

    If the wires have 100,000 volts at 100 amps, then switching them can be a real problem. If your signals are something different, you might want to share that information. ak
  19. AnalogKid

    Chip Sheet Data

    The 7404 is the original TTL hex inverter. The 7414 came later as the first Schmitt Trigger input TTL part. It is drop-in compatible with the 7404. The Schmitt input does not affect how it handles normal edge speed TTL signals. https://en.wikipedia.org/wiki/Schmitt_trigger Suggestion #1...
  20. AnalogKid

    Press a button to start a timer project? Thanks.

    Any particular reason you want to re-invent the stopwatch? Also, there are many stopwatch and timer kits available. Depending on all of the other project parameters you didn't share with us, this might be a fairly simple project to do in all hardware (no PIC, Arduino, etc.) What is the...
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