The Hardware Pages
Motorola MC1377P

Last updated on August the 16th, 2000.

  • Schematics:

  • Here are the VGATV schematics I've drawn recently.

    You have a choice of 3 formats: the original Tango-Schematic 1.20 S01 file, in a ZIP (since GeoCities doesn't like .S01), in PostScript format and as GIF file, whose thumbnail is found below. The image itself is much bigger.

    As a bonus, I found that adding SVHS output was very easy, so I did!

  • Printed Circuit Board:

    None yet.

  • Part List:

    - Components needed:

    1 Metal box
    1 DC socket, male
    1 PCB
    2 switches/jumpers

    CONN1 = Mini DB15P socket, female
    CONN2,
    CONN3 = RCA socket. female
    DL1 = 300ns Philips delay line. Motorola asks for a 400ns, and "Radio Plans" magazine uses a 470ns delay line in their schematic. I guess you should use whatever you get...
    Q1,
    Q2,
    Q3 = BC547
    U1 = Motorola MC1377P
    U2 = 7805, voltage regulator
    VC1 = 25pF, variable capacitor. Doesn't need to be exactly this value.
    VR1 = 47K, variable resistor
    X1 = 4.43Mhz crystal (PAL), 3.58Mhz (NTSC)
    XFMRI1 = Chroma bandpass transformer

    R1,
    R2,
    R7 = 1.8K ohm
    R3 = 2.7K ohm
    R4,
    R5,
    R6 = 47 ohm
    R8,
    R9,
    R10,
    R13,
    R16 = 75 ohm
    R11 = 33K ohm
    R12 = 220 ohm
    R14 = 3.3K ohm
    R15,
    R17 = 1K ohm
    R18 = 16K ohm
    R19 = 33 ohm
    R20 = 8.2K ohm
    R21 = 6.8K ohm

    C1,
    C2 = 10uF, 16V
    C3,
    C12,
    C13,
    C14 = 100nF
    C4,
    C5,
    C6 = 22uF
    C7,
    C17 = 1nF
    C8 = 10nF
    C9,
    C10 = 180pF
    C11 = 12pF
    C15 = 33pF (PAL), 47pF (NTSC)
    C16 = 10nF
    C18 = 62pF (PAL), 100pF (NTSC)
    C19 = 1uF

    You can also get the file version, if you want to.

    Below is a picture of my delay line and the chroma bandpass transformer, having the MC1377 below for size comparison.