Jump to content

Junctionmad

Members
  • Content Count

    2,182
  • Joined

  • Last visited

Community Reputation

578 Good

Recent Profile Visitors

411 profile views
  1. Perhaps “ simple” was misplaced , by the application of a simple amplifier , series pass element can be used. That can be a Darlington if required pic IO can handle upto 20 mA on certain pins
  2. One of the issues with ABC is any wheels shorting the ABC section back to the main DCC can cause issues with unexpected acceleration . So metal wheels on rolling stock bridging the section can cause issues some decoders are better at handling it then others
  3. You don’t have a curved object , but you can make ot up using the polygon object . You close the polygon by right clicking on the point before the proposed closure point
  4. I I’m not trying to stop a thread , merely thanking contributors and explaining what Ive done
  5. Essentially that’s the peak value but it’s not the DC equivalent
  6. There is no such thing as a “DC “ value of a square wave , there is a Peak , peak to peak , average or RMS value even rectifying it does nothing to resolve the DC component, adding a capacitor again doesn’t construct the original DC value of the signal , for example the ripple voltage can be very significant depending on the load hence the whole idea of trying to characterise a DCC waveform by some notional DC number is nonsense , misleading and meaningless.
  7. The easiest way to interface the pic is to a full H bridge driver chip. Then use alternating PWM signals from the pic alternatively a simple series pass transistor ( emitter follower ) could be used with the pic generating the base current drive.
  8. Note that a bridge rectifier will not improve a Dmms ability to correctly determine the DC level of a high frequency asymmetric pulse train like dcc , it’s actually very complicated to determine what it is. The text book definition is the equivalent hearing value but that’s impossible to measure with a DMM a bridge rectifier converts alternating current into unipolar current , it still remains a high frequency pulse train. DMMs for various reasons make have quite a low pass filter often to about a couple of kilohertz again making comparisons difficult. simply put you can’t really make any assumptions about the value a DMM reads out in these circumstances
  9. Thanks I have created a version of lambourn that suits our needs
  10. This topic interests me as I’m considering building a GWR ( late era ) banner repeator. I’struggling to find pictures , were they similar to the BR black armed electric i just saw now a picture on Flickr , after the end of steam at Worcester shed , this had a mechanical banner repeater with a white finial. However this may not be an original
  11. This topic interests me as I’m considering building a GWR ( late era ) banner repeator. I’struggling to find pictures , were they similar to the BR black armed electric repeator ?
  12. For ease of use I would suggest designing in a conventional H bridge motor driver IC. This avoids having to deal with short circuit situations , shoot through etc. Remember 70% of electronics ends up protecting the 30% actually doing the work !!! I would seriously suggest you join merg and put out a request for a design. There are considerable numbers of PIC experts there.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.