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Posts Tagged ‘DTMF’

Examining a vintage RAM chip, I find a counterfeit with an entirely different die inside

Friday, August 25th, 2017

Ken Shirriff writes, "A die photo of a vintage 64-bit TTL RAM chip came up on Twitter recently, but the more I examined the photo the more puzzled I became. The chip didn't look at all like a RAM chip or even a TTL chip, and in fact appeared partially...

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Posted in Chips, reversed | No Comments »

DTMF decoder test circuit

Thursday, September 26th, 2013

Kenneth Finnegan  writes: As part of a few projects I'm working on, I want circuits to be able to decode DTMF tones played over an amateur radio link for remote control. This can be done with a moderately powerful processor in DSP, but I opted to buy a handful of...

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Posted in testing | No Comments »

Propeller DTMF generator object

Sunday, March 4th, 2012

If you need to generate DTMF tones and have a Parallax Propeller chip handy, there's an object for that! Thomas E. McInnes has coded up this DTMF generator object for the Propeller. Written in Spin, the object includes functions for dialing individual digits or a preprogrammed phone number, along with...

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Posted in code, open source, Parallax Propeller | 1 Comment »

Recent Comments

  • Joe Desbonnet: Ya, I can recommend the low melting point solder. I used brand 'ChipQuik' and it's amazingly easy to use.
  • Jerome: I need a new BusPirate for the Fablab ;) Many thanks!
  • Max: Seems like an unexpectedly violent way to remove the chip indeed. A hot air station should of course do the job just fine, but in...
  • jose: Part removal described here is pure butchery, the cheapest hot air station will do a fast and clean job removing the QFP, heat air to...
  • Cody: Yes please