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  1. cliffclavin

    Adding audio to cctv via the arial?

    Hello all! At work we have a closed circuit television system. It is a very cheap kit! The CCTV camera (composite video feed) is fed into a rf device, so the CCTV camera is viewed through a TV arial type connection (not rgb/composite) This is plugged into the arial circuit used to pick up...
  2. cliffclavin

    Led display Digital Voltmeter question

    Hello! I would like to monitor the voltage from a sensor. The sensor produces 0 to 10 volts. I would like the display to show the voltage in relation to a scale of 1 to 2000. eg. 0v = 0 2.5v = 500 5v = 1000 7.5v = 1500 10v = 2000 The digital voltmeter project can be modified...
  3. cliffclavin

    Led display Digital Voltmeter mod

    Hello! I would like to monitor the voltage from a sensor. The sensor produces 0 to 10 volts. I would like the display to show the voltage in relation to a scale of 1 to 2000. eg. 0v = 0 2.5v = 500 5v = 1000 7.5v = 1500 10v = 2000 The digital voltmeter project can be...
  4. cliffclavin

    CMOS power use?

    Hello. I am hoping one of you smart people could help answer a question for me. I am nearly finished building a three stage timer/ controller out of CMOS 4000 series IC's - I have built & checked each section of the circuit, and it works ok! A 4093 Schmitt Nand Gate provides clock pulses...
  5. cliffclavin

    3 stage timer design

    Thank you so much for taking the time to help me! I am glad that the circuit will work as I had hoped! will using D Type Flip flops work instead, only because I have made the order for components already... It seems a shame to place another order for one Dual RS flip flop costing 49 pence...
  6. cliffclavin

    3 stage timer design

    Alun, thank you very much for taking the time to help. Pity the second soloution does not work - the schematic you provided was accurate. However, the last schematic posted (my first idea with the flip flops) has a problem? Just to clirify my desin involved using D- Type Flip Flops. You have...
  7. cliffclavin

    3 stage timer design

    I have drawn a clear diagram showing the above suggestion. http://cliffclavin.myphotoalbum.com/view_photo.php?full=1&set_albumName=album04&id=timer999 It looks ok, but I have a question regarding counter three triggering counter one. When the 10+ pulse comes from Counter Three, ithe...
  8. cliffclavin

    3 stage timer design

    Kevin Weddle : No offence taken - I am just a tad frustrated. :) :) :) I am re-working the diagramn to try and make it more readable. However, an alternative soloution has been suggested without the use of the flip flops. What do ya make of this ? : One way is to utilize the enable input of...
  9. cliffclavin

    3 stage timer design

    Kevin Weddle : Sorry that looking at the design makes you dizzy! Thats why I wish I had electronics workbench at my disposal. OK, I will try to make the diagram more readable. The only way I know how to use D-Type flip flops is in the bi-stable mode (toggle bistable / toggle flip flop) Do...
  10. cliffclavin

    3 stage timer design

    Thank you taking the time to reply - I will look into the CMOS 4538. Thanks for ya advice about interference - your post sounded like a knightmare trying to remove interference! The circuit will be powered by 12v dc - one of the reasons I chose the 4000 series of IC's was the 'lack of...
  11. cliffclavin

    3 stage timer design

    Hello I have some experience building electronic kits as a kid - radio's, transmitters, amp's etc. Later at University I was taught aspects of digital design using Electronics workbench - such as logic gates, flip flops, binary adders etc I have a basic working knowledge but with some gaps...
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