Recent content by sigmacom1

  1. sigmacom1

    Help needed building a radio transmitter/receiver system

    DTMF, huh? Good and cheap solution, but too "classic analog" don't you think? I prefer digital; it's more secure... Anyway, I think it's perfect for our friend with the level of knowledge he has. Tips for james120479: - You can ommit the flip-flops (4013) if you don't want to hold the last...
  2. sigmacom1

    Help needed building a radio transmitter/receiver system

    If you can work with these chips (I say that because of your level of knowledge), then choose an RF transmitter & receiver from http://www.rfsolutions.co.uk/products/rf_modules/Am_fm.htm or http://www.abacom-tech.com/receivers.htm and http://www.abacom-tech.com/transmitters.htm Some of them...
  3. sigmacom1

    Quick question - Solid state Relay

    I agree with this: "Solid State in my mind means not mechanical" but the schematic, can't be called "a solid state relay": As you know, relays offer isolation between the relay contacts and the coil. Also, you can control (on-off) any kind of voltages/currents, with indepedent voltage on coil...
  4. sigmacom1

    Help needed building a radio transmitter/receiver system

    Hello! First of all, I don't know these chips you are reffering to, so please give some info (URL of datasheets, etc). There are many ways to do what you want, easy, cheap, etc. Are these chips available, and if yes, what is the total money cost?
  5. sigmacom1

    Quick question - Solid state Relay

    Yes, but this is not a solid state relay, as the title of this thread says... ??? ???
  6. sigmacom1

    DIGITAL DESIGN

    Is it mandatory to use 74ls283 and 74ls194?
  7. sigmacom1

    comparator= inverter?

    A very simple approach, is shown in the following schematic. The 2 resistors of 1 kOhm each, make a voltage divider /2, providing a Vcc/2 voltage to the (+) pin of the comparator. This is used to set the (+) input at higher voltage vs the (-) input -and so- force the output (Y) to high state...
  8. sigmacom1

    Quick question - Solid state Relay

    Also notice that most common solid state relays, are made to handle ONLY RESISTIVE LOADS, not inductive (like as a motor). Else they burn... There are specific type of solid state relays to handle that kind of loads. Seek for them. :)
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