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  1. N

    MAX7219 and higher voltage LED displays - how?

    http://uk.farnell.com/maxim-integrated-products/max333cpp/ic-analogue-switch-quad-spdt/dp/1422308 http://uk.farnell.com/vishay-siliconix/dg419dj-e3/ic-switch-spdt-dip8-419/dp/1077115
  2. N

    MAX7219 and higher voltage LED displays - how?

    You may be able to use a couple of DG419 or ADG419. I believe a DG333A or ADG333A is the same as a MAX394 (but not sure, you will have to compare datasheets)
  3. N

    MAX7219 and higher voltage LED displays - how?

    It looks like the circuit on page 12 of the datasheet switches the cathode to -5V, thus providing 10V between anode and cathode. (+5V from the 7219 anode segment drivers & -5V thru the fets)
  4. N

    Simple Conversion Circuit

    The motor will only draw as much current as it needs, whether you use 2 LR41's or 2 D cells. Adding a resistor will only slow down the motor. If you are concerned about excessive current draw due to motor failure, put a low value fuse in series with the external batteries.
  5. N

    Digital Counter triggering.....

    If it's a mechanical counter, you may have to provide a power source through your switch to get it to count.
  6. N

    Building small -V Power Supply using Max232

    The MAX232 is an RS-232 communication chip, why not try a MAX680 or MAX681 or an ICL7660, there should be schematics on how to do this on their datasheets.
  7. N

    5V Rectifier Intermittent Due to Heat?

    You may also try reflowing the solder on the rectifier. Constant heating & cooling on equipment that old can produce a cold (dry) solder connection.
  8. N

    digital scales circuit AD620 op amp not working?

    You gain calculations for this device are incorrect. First circuit gain = 49400/100000+1 = 1.494 Second Circuit Gain = 49400/2320+1 = 22.3
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