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  1. Minder

    Help Programming 16x2 LCD - PIC16F73

    The write to a line is address (in Hex) 0x80 for 1st line, 0xc0 for second line, any subsequent write to a line will increment the position, if you want to write to a particular char in either line, then add the posn to either 0x80 or 0xc0. I don't use C so I cannot help very much with the...
  2. Minder

    Help Programming 16x2 LCD - PIC16F73

    Here is nigel's code in C http://www.electro-tech-online.com/articles/nigel-goodwins-tutorials-in-c.467/ Except I see you are using the 8 it data instead of the dual 4 bit method. M.
  3. Minder

    Can You Paint a Circuit Board?

    http://www.dymax.com/adhesives/electronics/conformal-coatings?gclid=CLH70Y2CwcsCFQwxaQod_akOWQ M.
  4. Minder

    Hook Up Wire for PSU

    TR-64 small(er) OD OA. http://www.weicowire.com/index.php?route=product/category&path=184_50_219_90 M.
  5. Minder

    Can You Paint a Circuit Board?

    This is typically done with Conformal Coating, or Glyptal aerosol, although they can be had in a small can also. M.
  6. Minder

    PIC16F877, 250Hz PWM

    This for starters. PWM Period = [(PR2) + 1] • 4 • TOSC • (TMR2 Prescale Value) http://www.micro-examples.com/public/microex-navig/doc/097-pwm-calculator.html M.
  7. Minder

    A snubber circuit

    Normally the snubber would be a resistor in series with a capacitor, but generally there is only one suppression device needed, the diode or the R/C circuit. The R/C parallel configuration characteristics is opposite to the series type. M.
  8. Minder

    dim led w photo resistor?

    Because the P.C. still has resistance, just increases with light. M.
  9. Minder

    Killing SSR (relays) - Need to understand

    Canada/US is dual voltage 120/240 single phase, large demand systems and appliances are 240v fed. M.
  10. Minder

    Killing SSR (relays) - Need to understand

    Personally I don't think it is a inductive issue, I suspect it is more of a current issue and needs some empirical testing to find out the actual current that is occurring. But a heat sink on the SSR's should also help. M.
  11. Minder

    Killing SSR (relays) - Need to understand

    I see you have added a layout, as suspected it appears to be a PID burst firing set up. Is this a commercially installed system or custom built? M.
  12. Minder

    Killing SSR (relays) - Need to understand

    Your heating coils are drawing maximum current when cold, so if you are switching on/off this is causing maximum stress on the SSR. It sounds like your controller is using burst firing to control a PID loop or ? You may need to get a higher rated SSR or mock something up, circuit wise with a...
  13. Minder

    PIC programmer

    Check to see if Pic-kit 2 will program a 12F1571 there is a stand alone program Picit2 V2.61 that has a digital analyzer etc in it which can be handy. M.
  14. Minder

    Newbie - Need some help w/ switching relays

    You may be able to do it with steering diodes, but it depends on the nature of the switch etc. M.
  15. Minder

    Neon glow bulb (ne-2) arcs/flashes when powered

    Doesn't the spec sheet show 3ma? Assume the Neon to be zero ohms. M.
  16. Minder

    Troubleshooting welder wire speed control

    A search shows up many app notes that show it as an SCR? M.
  17. Minder

    555 PWM or is it?

    This is the one i use for PWM circuit testing. http://www.discovercircuits.com/DJ-Circuits/simplepwm2.htm M.
  18. Minder

    Old Betamax channel indicator lights, not LED.

    A mixture of Neon and Krypton will glow green on a Neon lamp, if they are AC fed then that is what these are, I suspect you may have a problem getting BetaMax parts!! M.
  19. Minder

    Arduino + Relay(220V) Problem.. Need Help!

    If you use a 2n7000 you can eliminate some components, also have you looked at SSR's, and eliminate the relay, I am not sure if the Arduino would drive the SSR direct, I have never used them. M.
  20. Minder

    Difference between ground and -ve voltage

    Unfortunately that does not make it right, you will also see circuits drawn correctly by those that know the difference and conform to the standard. One of the main perpetrators of this error in conformity is the widely acclaimed book 'Art Of Electronics' which use it throughout the book, of...
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