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Schematic component queries.

Discussion in 'Electronic Basics' started by Clubsprint, Nov 14, 2007.

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  1. Clubsprint

    Clubsprint Guest

    G'day all
    I found these circuits on the web and was interested in building them,
    however I'm not 100% about all the
    parts of the circuits. Would someone please have a look at answereing my
    questionsabout them.
    Thanks

    In the circuit http://clubsprint.250free.com/GT-2pn.gif
    What is VB referring to?
    What is the A in a circle near the end of the circuit?
    What are the two components that look like transistors
    with a diode connected near the right side of the circuit
    near R9?
    What do you think should be the values of the diodes?

    in the circuit http://clubsprint.250free.com/DDPN.gif
    What is VB1 referring to?
    What is VB2 referring to?
    What is the A in a circle near the end of the circuit?
    What are the two components that look like transistors
    with a diode connected near R18?

    in the circuit http://clubsprint.250free.com/XXLpn.gif
    What are the boxes markesd CLK?
    What is the function of the switch near R27?
    What are the two components that look like transistors
    with connections marked A and B near the middle of the circuit?
    What is VB referring to?
    What is V+ referring to?
    What are the values of the diodes?
     
  2. Tom Biasi

    Tom Biasi Guest

    The two circuits are meant to connect together.
    The A and B show where.
    You can see VB is made from the 9 volt source.
    V+ is the main positive supply.
    The two components that look like transistors ARE transistors. FET (look it
    up)
    The diodes are probably small silicon.
    Clk is a clock circuit and the switch is selecting different characteristics
    of the amplifier.

    Tom
     
  3. Clubsprint

    Clubsprint Guest

    Hi Tom
    Thanks so much for your input. It's obvious when someone points it out to
    you.
    I'm pretty rusty at this stage (I'd forgotten about FETs).
    On the clock circuit, do you think this could be a commercially available
    item or
    something proprietry?
    Thanks
     
  4. Clubsprint

    Clubsprint Guest

    As a bald yellow guy says quite often "DOH". Wood for the trees eh?
    Thanks so much for your help.
    Bought a breadboard and lots of components today, lots of playing to come.
    Thanks again
     
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