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  • Users: monkeysolder
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  1. monkeysolder

    What do you call those little wires with sockets at both ends?

    What do you call those little single wires with a socket at each end? The little sockets fit nicely into headers that you find on PCB's. I am trying to search for them on Digi but don't know what to call them. Thanks, artist's depiction: ]----------[
  2. monkeysolder

    Fixing bad sectors on a Linux drive

    I have a question about a Linux (EXT3) drive that we are using in a 3rd party embedded application, concerning how the 'bad sector' table is stored. 1) I remove the HD from the embedded Linux hardware, remove the Linux partition, run chkdsk and repair bad sectors. I do this because I have no...
  3. monkeysolder

    Somewhat unusual question - Hard Disk "Air Bearing" failure

    I hope this is in the right forum - We are having an unusual problem with a piece of equipment that uses a 2.5" fixed hard disk drive housed in a small, water and airtight sealed enclosure. Prior to sealing, we purge the entire enclosure of air using tetrafluoroethane. (Commonly available in...
  4. monkeysolder

    Somewhat unusual question - Hard Disk "Air bearing"

    I hope this is in the right forum - We are having an unusual problem with a piece of equipment that uses a 2.5" fixed hard disk drive housed in a small, water and airtight sealed enclosure. Prior to sealing, we purge the entire enclosure of air using tetrafluoroethane. (Commonly available in...
  5. monkeysolder

    Video Encoding - Hardware vs Software

    I don't have enough practical experience with video compression to answer this question so I'll ask you guys. I'm trying to spec out a video capture system running on a Pentium 738 (Pentium M 1.4GHz, Low Voltage) embedded computer system. It has "framegrabber" cards integrated that use the...
  6. monkeysolder

    ok to replace coax with ribbon cable?

    I'm looking to send a baseband(I think this is the term - It is a standard NTSC security camera) video signal over a short run of about 5ft. DC power and Audio will also be running along the same length and I was looking to just use a single ribbon cable (28AWG) rather than source a composite...
  7. monkeysolder

    multiheaded cable assembly

    Hello - I am making some multiheaded cables - Basically a 10 pin connector at one end and about 7 different connectors on short lengths of cable branching out at the other end. They are small quantity so custom molding is probably out of the question. Does anybody know of any way to...
  8. monkeysolder

    military radio microphone bias

    Hello - I have a H-250 military handset and am having problems figuring out how to bias the microphone properly. The sound is very faint coming from the mic. Does anybody know what the proper bias voltage is for microphones in military handsets? Or what mic voltage is provided on military...
  9. monkeysolder

    Relay question

    I would like to use this MOSFET-based relay to switch power on and off to small electronics and have a couple questions. Please let me know if any of this is unclear... http://www.irf.com/product-info/datasheets/data/pvn012.pdf 1) It shows a 4.5A load current capability but it doesn't appear to...
  10. monkeysolder

    Compact Flash to IDE converter

    I've seen adapters that convert an IDE socket to a CompactFlash socket so that you can do a solid state boot on a PC, but does something exist that will convert it the other way? I'm looking to attach a laptop drive to a CompactFlash device in order to up the storage capability. For example, I...
  11. monkeysolder

    Quick Question - BGA packages and pcb's

    Hello all- I am considering using a BGA packaged module for the first time and was wondering if any of you guys had any experience with making the pcb's for these. It is an 11x11 array with 2.5mm spacing. The other option for the module is a surface mount board-to-board connector, but it is...
  12. monkeysolder

    Audio noise with op-amp. Need recommendations.

    Hello - I am using a LM324 op amp to amplify an unbalanced signal and am getting a large amount of hum. I suspect this is due to the power source for the op-amp because when we take the op-amp out of the loop and listen to un-amplified audio, it sounds fairly clean. Perhaps the power noise is...
  13. monkeysolder

    adjusting microphone bias voltage

    I am looking for the simplest way to solve a problem I am having with a microphone circuit. I am powering a microphone (not the one attached to the handsfree earpiece) using a cellphone headset jack. My problem is I am getting a very faint microphone audio signal. The microphone needs a bias...
  14. monkeysolder

    power and RS-232 signal over distance

    Hello again - You guys were so helpful on the last question so I have another problem that I am curious about. Short Description: I am running rs-232 signal over a 50 ft length of cable (28AWG ribbon, shielded). I am also running power (12V, ~1A) and ground, each over 3 of the 28AWG wires...
  15. monkeysolder

    Ridiculously easy opamp circuit not working

    At my wits end here. I must be missing something incredibly basic. Thanks in advance. I have wired up a simple non-inverting opamp circuit to a LM324A. I have a 10k potentiometer connected across the inverting input and output of the opamp, and a 2k resistor between the inverting input and...
  16. monkeysolder

    audio question - multiplexing audio channels

    I have 8 audio channels that I would like to multiplex together (4 headsets from cell phones, 2 channels per headset (speaker/mic)). Only one cellphone will be operating at a time, so it will be more like a switch. Would it be electrically sound if I simply connected all the outputs(earphone)...

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