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So I'm building a musical sequencer that uses a shift register to close relays and pass the discharge pins of three 555 timers through a manual switch and potentiometer (acting as a variable resistor) to vcc. Here's somewhat what it looks like, but with only a SPST relay, and no integration of the flip-flops that will add a single bit to the register when the device is turned on.

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I want the shift register to trigger all three 555 "channels" at once, so I can play chords.The only problem is, I'd need one TPST relay for each step, that's 8 per 8-bit shift register, and they're fairly expensive.

I was just wondering if there was a cheaper alternative to TPST, or three SPST, relays. Name ideas are also cool. Not sure what I want to call the thing. It's going to be modular and block-based, so I can daisy-chain more shift registers to the end to add more notes.

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  • \$\begingroup\$ you might get away wit using bilateral switches like 4016. There are quite a few alternatives fairly easy to find if you Google around a bit. These devices are probably much cheaper than your relays and they don't make a clicking sound. \$\endgroup\$ – jippie Dec 8 '13 at 10:03
  • \$\begingroup\$ @jippie that sounds like a good answer \$\endgroup\$ – Andy aka Dec 8 '13 at 13:28
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You might get away with using bilateral switches like 4016. There are quite a few alternatives fairly easy to find if you Google around a bit. These devices are probably much cheaper than your relays, don't make a clicking sound and basically are analog small signal switches.

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  • \$\begingroup\$ Jippie, may I name my device after you? JippieSynth or something of the like? \$\endgroup\$ – Fruity_Grebbles Dec 9 '13 at 20:07
  • \$\begingroup\$ @Fruity_Grebbles Sure as long as you don't use my avatar. \$\endgroup\$ – jippie Dec 9 '13 at 20:14

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