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4046 PLL Frequency Multiplier Module

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  • vintagekiki
    replied
    https://www.paia.com/manuals/docs/9308-fatman-manual.pdf

    http://www.paia.com/manuals/docs/9308_MIDI_Ch_Detail_81414.pdf
    9308 FatMan MIDI Channel Select DIP Switch

    Leave a comment:


  • dmeek
    replied
    One problem with this circuit is that the input at pin 14 will have to be 0 to -12V. It would be better to run the chips on +5v, then you can use the 74HC series and the input would be 0 to +5v like most other logic.
    Instead of the 324 op-amp at the output you would need one that works on 5V like TLC271

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  • BlackbeardsBrother
    replied
    Ah thanks to you both (including the maximum power hint). I never would have thought about sharing the load as a possibility .

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  • dmeek
    replied
    My best guess is the designer wanted to share the load between the + and - power supplies.
    More important though is that the 74HC4046 maximum power supply is 7V. You need to use the MC4046 or CD4046

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  • Leo_Gnardo
    replied
    That is odd. Maybe PAIA powered their modules from -12, and that's the way they use to get positive-power components to work with a negative rail. Any PAIA hobby builders here? They had a lot of kits available in the 1970's.

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  • BlackbeardsBrother
    started a topic 4046 PLL Frequency Multiplier Module

    4046 PLL Frequency Multiplier Module

    I found an intriguing sketch for a "PAiA Fatman Frequency Multiplier Module" (see link) and thought I could put my 74HC4046A chip and all the flip flops I have laying around to good use by recreating it. Unfortunately, the sketch has me stumped right from the beginning: why is Vcc going to ground and the GND input of the chip to -12V? I understand that it will still work in principle since all voltages are being shifted down by 12V, just not why. Why not connect the usual way with Vcc at 12V and GND to 0V?

    I should add I'm a novice with no experience with Fatman systems.
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