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  1. CDRIVE

    Temperature sensor

    I would recommend finding a proper replacement. Where have you looked? I found quite a few 10K @ 25degC on ebay but many had no charts. This one does...
  2. CDRIVE

    VHF Repeater system

    I asked for the band because repeater receive and transmit frequencies are not the same. I must say that I'm a bit skeptical about anyone being put in charge of a repeater and hand held radios when your superiors haven't even provided you with basic information and insured that you understand...
  3. CDRIVE

    Problems with sound circuit on a toy train

    I think I've become jaded. I read that and immediately dismissed it thinking that you probably shorted two traces which may or may not have been stressful on the circuit. I'm glad Harald caught that and correctly diagnosed it. It's really not that uncommon. The two most common faulty or...
  4. CDRIVE

    Need recommendation for rheostat or potentiometer

    A high wattage Rheostat solution is absolutely archaic! Besides the size of the beast have you considered the weight? Moreover, large high power Rheostats require probably >10 times the torque of a small Pot to turn them. I have some huge ones made in the 1940s that you damn near need a wrench...
  5. CDRIVE

    Temperature sensor

  6. CDRIVE

    Electronic Alarm For Email Alert

    mydeen, welcome to Electronics Point. Email received on what device? Chris
  7. CDRIVE

    New to the forum and I plan on expanding my knowledge in electronics, especially soldering.

    Welcome to EP. The answer to your last sentence would be soup to nuts with the exception of OU electronics, physics. Chris
  8. CDRIVE

    Mosfets and second(ary) breakdown

    Yet another revelation that I'm reading for the first time. I'm not too proud to admit it....Sucks though! :( Chris
  9. CDRIVE

    Controlling Motorized slide potentiometer from dsPIC33EP512MU810

    How can someone suggest code when we don't know what you want the motor drive to do and when to do it? IE: If, Then, Else. Chris
  10. CDRIVE

    VHF Repeater system

    I'm still curious though. What band does this repeater operate on? Chris
  11. CDRIVE

    455 KHz tunable BFO circuit

    Did you look here? http://www.ebay.com/sch/i.html?_from=R40&_trksid=p2050601.m570.l1313.TR0.TRC0.H0.X455+KHz+ceramic+filter.TRS0&_nkw=455+KHz+ceramic+filter&_sacat=0 Chris
  12. CDRIVE

    Envelope detector design

    The 1N34 is still as popular now as it was when I was a kid. That was along time ago. http://www.ebay.com/itm/20pcs-1N34A-Germanium-Diode-DO-35-1x-1N34-US-SELLER-FREE-SHIPPING-/272401581252?hash=item3f6c6644c4:g:f7wAAOSw14xWPURc Chris
  13. CDRIVE

    Problems with sound circuit on a toy train

    We love schematics but in lieu of one sharp photos can help. Chris
  14. CDRIVE

    Envelope detector design

    Don't Arduinos have boot loader overhead that slows things down like a Picaxe? Have you considered using a much faster MCU like a 32MHz PIC? Chris
  15. CDRIVE

    Modifying AGC circuit

    It was drawn and simulated in Tina11Classic Design Suit. Chris
  16. CDRIVE

    VHF Repeater system

    "I just follow orders sir". Carry on Cadet. Chris
  17. CDRIVE

    Modifying AGC circuit

    I couldn't resist simulating this so here it is. I couldn't make out if R8 is 10K or 100K. 100K seemed a bit much so I used 10KΩ. The sim is swept 4 times starting at 40mVPP to 20VPP input. Chris
  18. CDRIVE

    VHF Repeater system

    Yeah, I forgot that and as you mention I think we'd all like to know "what ever the heck that is". :confused: LightShow hails from your neck of the woods. I sincerely doubt that Australia lets anyone who wants to put a repeater on the air do so unregulated. Chris
  19. CDRIVE

    VHF Repeater system

    Actually, I suggested sending Morse code because too many hams have forgotten or for that matter, never learned to copy it in the first place. I thought it would be good for them to hear it on a regular basis. :) On that note I'm curious. Doesn't your repeater transmit its call sign with Morse...
  20. CDRIVE

    Low cycle Pulse generator ?

    I asked because switching the relay coil to GND (low side switching) affords configuring the transistor as a common emitter amplifier. When saturated It will deliver nearly full battery voltage to the relay coil. Chris
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