Jump to content
Electronics-Lab.com Community

hotwaterwizard

Members
 View Profile  See their activity

  • Posts

    2,022

  • Joined

  • Last visited

 Content Type 

Posts posted by hotwaterwizard

  3. Power supply for AMP in CAR

    in Electronic Projects Design/Ideas

    Posted

    The problem with this design is Current handling capability.
    The project you are looking at is only about 5 amps and a 100 watt Amplifier needs about 20 amps. You should make sure the transformer is 20 amps or better and use about 8 of the 2N3055 transistors 4 and 4 hooking three in parallel with each original.
    Also see my post on the subject.

    http://www.electronics-lab.com/forum/index.php?board=22;action=display;threadid=222

  6. Help with 60 second stopwatch project

    in Electronic Projects Design/Ideas

  13. LEDs or Lamp Sequencer

    in Projects Q/A

    Posted

    Sequential Flasher
    Here is a simple circuit for sequentially flashing Christmas light strings or other similar low-power lamps. The socket symbols may be single bulbs or sockets for lamp strings. The load must be capable of operating from DC since the SCRs rectify the line voltage. The SCRs must be sensitive-gate types and must be able to handle the load current and line voltage. The 1uF capacitors are non-polar film types. A fuse is indicated and a GFI type of outlet is recommended.
    Warning: This circuit should be constructed only by persons with the qualifications to work on and design high voltage circuitry. Necessary safety considerations are not indicated. All parts of the circuit should be considered "hot".

    The circuit may be extended by repeating the pattern with the last neon lamp connecting back to the first through a capacitor. Although a quick breadboard was tested, this circuit is "experimental" and may require some tweaking for best performance. The flashing speed may be controlled by connecting a 100k ohm (or larger) potentiometer across the 10 uF capacitor and connecting the 1 meg resistors to the wiper. Make sure that the shaft is an insulated type. The 1 meg resistors may be lowered in value for faster flashing.

    post-787-14279141583428_thumb.jpg

  23. how can i find...

    in General

    Posted

    American Wire Gauge
    AWG OHMS PER WIRE
    SIZE 1000 FT. DIAMETER
    1 .1264 .2893
    2 .1593 .2576
    3 .2009 .2294
    4 .2533 .2043
    5 .3195 .1819
    6 .4028 .1620
    7 .5080 .1443
    8 .6405 .1285
    9 .8077 .1144
    10 1.018 .1019
    11 1.284 .0907
    12 1.619 .0808
    13 2.042 .0720
    14 2.524 .0641
    15 3.181 .0571
    16 4.018 .0508
    17 5.054 .0453
    18 6.386 .0403
    19 8.046 .0359
    20 10.13 .0320
    21 12.77 .0285
    22 16.20 .0253
    23 20.30 .0226
    24 25.67 .0201
    25 32.37 .0179
    26 41.02 .0159
    27 51.44 .0142
    28 65.31 .0126
    29 81.21 .0113
    30 103.7 .0100
    31 130.9 .0089
    32 162.0 .0080
    33 205.7 .0071
    34 261.3 .0063
    35 330.7 .0056
    36 414.8 .0050
    37 512.1 .0045
    38 648.2 .0040
    39 846.6 .0035
    40 1079. .0031
    41 1323. .0028
    42 1659. .0025
    43 2143. .0022
    44 2593. .0020
    45 3348. .00176
    46 4207. .00157
    47 5291. .00140


×
×
  • Create New...