chipcorder
Around the turn of the century I designed a little chipcorder for a museum project (as a subcontractor). It would play some animal sounds at the push of a button.
It was designed around an ISD33120 chip. Recording/playback time was a whopping 120 sec.
The empty socket holds a PIC16F84 processor. The device was controled via a serial port.
The ICL232 is used in a rather 'unintended' way.
There are 2 receive channels and 2 transmit channels. 1 tx channel is used as expected to provide the rs232 +/- swing. One receive channel provides esd protection for the switch, the second rx channel is used for level conversion for port RA4 of he pic.
Back then my circuitboards were tinned, even after 10 years they still shine! Soldered with leaded tin :)
10 years ago there was nothing affordable (think cheap) but for a more recent project I wrote a little program for the H0420 card, a very affordable mp3 player card from compuphase.
It was designed around an ISD33120 chip. Recording/playback time was a whopping 120 sec.
The empty socket holds a PIC16F84 processor. The device was controled via a serial port.
The ICL232 is used in a rather 'unintended' way.
There are 2 receive channels and 2 transmit channels. 1 tx channel is used as expected to provide the rs232 +/- swing. One receive channel provides esd protection for the switch, the second rx channel is used for level conversion for port RA4 of he pic.
Back then my circuitboards were tinned, even after 10 years they still shine! Soldered with leaded tin :)
10 years ago there was nothing affordable (think cheap) but for a more recent project I wrote a little program for the H0420 card, a very affordable mp3 player card from compuphase.
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