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  1. hevans1944

    Optical Pickup

    As many of us responding have been quick to point out. An optical pickup sounds sexy and "state-of-the-art," but if such a thing existed it would be a "solution in search of a problem to solve" because magnetic pickups allow a simple and elegant solution to the problem of how to convert a...
  2. hevans1944

    Optical Pickup

    That's pretty generous of you, Bob, given this is a mechanical engineer with minimal electronics knowledge who probably knows didly about synthesizers. Also, the proposed infrared receiver is only vaguely described in terms of its functionality, without a clue as to how said functionality will...
  3. hevans1944

    Optical Pickup

    This appears to be an ill-conceived project. Magnetic pickups have been used for decades to convert steel string vibrations to proportional electrical audio signals. The only reason I can think of NOT to use a magnetic pickup is if the instrument is strung with something other than steel...
  4. hevans1944

    breakers and power

    Sounds to me like you desperately need the help of a licensed electrician.
  5. hevans1944

    Hello All Pls Help.me

    These el-cheapo Chinese meters are impossible to repair... no documentation, proprietary and unidentified parts which cannot be removed and replaced. So why bother even attempting to do so? Just trash it and purchase a replacement for ten bux.
  6. hevans1944

    Connectors/cables suitable for removable modification boards?

    I encountered a similar problem a few years ago when I wanted to "breakout" some RS-232 signals. I found a mating pair of DB-25 connectors, socket and plug, with removable terminals. After disassembling these, I was able to solder on insulated wires and add a bit of heat -shrink tubing to create...
  7. hevans1944

    Certificate issue with electronicspoint.com

    I was "pretty sure" it was an EP server problem, since I could access other https:// sites in a normal fashion. So, I just went to bed and waited for Ian to "fix it," which he did. Thanks, Ian, for getting on top of this so quickly! I will admit that I was tempted to bypass the security...
  8. hevans1944

    Motion Sensors?

    The crux of it is adaptive learning algorithms that identify and separate ordinary human motions, such as moving the spoon from dish to mouth, from human tremor motions. Using MEMS accelerometers and MEMS rate gyroscopes the 3D orthogonal components of these motions can be digitized and...
  9. hevans1944

    Motion Sensors?

    Perhaps you should consider exploring some of the links here on this Google search results page.
  10. hevans1944

    Basic PIC18F4520 TX/RX question

    As I was picking through my fine collection of "electronics junque," trying to decide what to take to Florida and what to leave behind, perhaps saving for a future trip, I ran across several modems. But it never crossed my mind that these would in any way be useful in Venice, FL, so they stayed...
  11. hevans1944

    Basic PIC18F4520 TX/RX question

    The Hayes Command Set was unique to Hayes modems, IIRC, but widely copied by other modem manufacturers who advertised their products as being "Hayes compatible" when often there existed differences in how these "Hayes compatible" modems interpreted and acted upon AT commands. I used both Hayes...
  12. hevans1944

    Basic PIC18F4520 TX/RX question

    Glad to see you figured it out. From your code listing, it appears you have "hard coded" the ASCII string "ATZ<null>" when it should have been "ATZ<cr>" Note that so-called "AT Commands" are left over from telephone modem technology. The "AT" stands for "ATtention" and signifies the characters...
  13. hevans1944

    Basic PIC18F4520 TX/RX question

    If you plan to use the PIC's EUSART to do this, I suggest that you read and understand why asynchronous characters begin with a start bit, end with a stop bit, and have only eight or nine NRZ (non-return to zero) data bits in between. Extending the number of data bits as you suggest requires...
  14. hevans1944

    Trying to TEG cooler to reach 5w

    Then this could be the TEG device you should consider using. There are others, so check them out here. Marlow Industries, Inc. also makes TEG devices, although lower maximum working temperatures. Check them out here.
  15. hevans1944

    Trying to TEG cooler to reach 5w

    Yessiree. The OP is FOS for thinking the power specs that apply to using the Peltier device as a cooler (heat pump) apply in any way to the power produced when the Peltier device is used as a TEG or Thermo-Electric Generator. Unfortunately, most folks "experimenting" with alternative methods of...
  16. hevans1944

    Trying to TEG cooler to reach 5w

    AFAIK, all Peltier diode stacks do generate power, but not very efficiently. Their biggest deficiency, other than the expense, is a very limited range of temperatures through which they can operate. For more information please visit some of the links on this Google results page concerning...
  17. hevans1944

    Trying to TEG cooler to reach 5w

    Surely you don't expect this device to produce 23.6 watts of power at 9.24 A when the hot side is 50C warmer than the cold side? The specs you provide, which are also included on the datasheet, are the performance you can expect when the device is operated as a heat pump, moving heat from the...
  18. hevans1944

    Looking for IR receiver that controls 4 relays

    The IR remote provides twelve independent channels. You said you only needed four. It is a trivial matter to wire two channels to latch and un-latch a third separate relay, thus providing you with six channels (instead of just four) of on/off control. Do you have any experience with electricity...
  19. hevans1944

    Looking for IR receiver that controls 4 relays

    You might try looking here.
  20. hevans1944

    Hi Everyone from Calgary

    That's what got me involved with SMD construction. I ordered some six-pin PIC10F206 from Microchip, which come in an SOT-23 package. I also ordered some 8-pin header adapter boards to allow the PICs to be soldered in place on the adapter boards and then plugged into a prototyping solderless...
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