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  1. CDRIVE

    how replace mechanical pot with an IC digital pot

    Check out the AD5228(DigPot) data sheet but all of what Steve said applies here, especially the driver issue because it's not meant to drive 30 Ohm loads. IE. it's not a power handling component. Chris
  2. CDRIVE

    Woo-Woo Power saving speculation

    Wow! When I began reading the first post I thought it sounded like more of the typical magic energy saving babble. I reserve judgment because the post was so long that my eyes glazed over causing me to loose interest. :rolleyes: Chris
  3. CDRIVE

    Relay or contactor for 50KHz, 1.9Arms?

    Back when it was Kilocycles I used KC. Since then I've used KHz. This is because anything less than units (milli, ucro, nano, pico) is always represented in lower case and everything above units (Kilo, Mega, Giga, Tera) is represented in upper case. Admittedly my Tina wants to see lower case...
  4. CDRIVE

    PCB tips...

    OK, I've got your drift now. Since all of the harmonic content in a square wave is generated on the fast rising and falling edge have you considered the following? Make the RC ramp linear (constant current) to generate a triangle waveform ramp. Tap off the ramp, buffer it and feed it to the...
  5. CDRIVE

    PCB tips...

    Is that supposed to be a PW of voltages? If so we're talking about a form of FM transmission and detection? Chris
  6. CDRIVE

    PCB tips...

    I your case (laser diode) light itself is the carrier. It need only be modulated. Chris
  7. CDRIVE

    PCB tips...

    If you're transmitting audio via laser diode why can't you feed it DC and modulate it (AM) conventionally? Chris
  8. CDRIVE

    Problem with a homemade ECG

    Thanks for the links mates. I was just curious to know if I knew the developer. Chris
  9. CDRIVE

    Problem with a homemade ECG

    Where did you download the VB6 source code from? Chris
  10. CDRIVE

    Emergency Vehicle Lights

    You may want to look at Marlin P. Jones. It's hard to beat their prices. http://www.mpja.com/LEDs/products/116/ Chris
  11. CDRIVE

    Multiple Leds from single analog output

    A uC can provide 3 output states. High, Low and Off. This translates to controlling 2 loads per output. Logic... Output High: Load1 is On Load2 is Off Output Low: Load2 is On Load1 is Off Output Off: Load1 & Load2 are Off Chris
  12. CDRIVE

    Multiple Leds from single analog output

    You're describing an ADC. Chris
  13. CDRIVE

    PCB tips...

    What's the power dissipation of your laser diode? Chris
  14. CDRIVE

    Looking for low resistance Analog SPDT

    Yes but with a caveat. Transistors used in switching mode work best when they're switching to the negative rail (0V) of the supply. We call this Low Side Switching. Transistors can switch the positive rail of the supply (High Side Switching) but it requires PNP Transistors or PCHAN MOSFETs...
  15. CDRIVE

    Emergency Vehicle Lights

    You do know that what you're attempting is illegal in PA and most, if not all, of the States? It's a gnat's a$$ away from installing a siren. Chris Edit: Oh sh!t I missed that you're a VFF! :eek: Never mind......:o
  16. CDRIVE

    Looking for low resistance Analog SPDT

    This (see bold) is not clear to me. Is it a SPDT Switch or SPDT Relay that you're looking for? Either way there are copious models out there. Chris
  17. CDRIVE

    Sound meter for Band ...mic?

    I know Audio Guru from another forum. You know how my avatar makes me look like an old grump? Well he actually is! :D That fact doesn't disqualify his designs though. ;) He's really quite good and he's earned his handle.. Chris
  18. CDRIVE

    Project: Motor And Car Battery

    That's a good tip but please don't dump that stuff on coral unless you're sure you're going to drown. ;) RE, lead acid batteries. Am I mistaken that even the sealed variety still must vent? If they do that will be hydrogen gas. Chris
  19. CDRIVE

    650W test load

    Since the source freq is constant at 50KHz it might be feasible to tune out the reactance. Chris
  20. CDRIVE

    Controlling stepper motor with a computer

    Ha, it does open up a whole new aspect of electronics and ways of doing things. Every time I'm working on making a 555 do more than its basics I always think of how much easer it would be with a Picaxe. Chris
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