DTMF Circuits

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Buffered breakout box
100K megohm DC probe
the designs of three phases SPWM variable frequency power supply of DSP
Computer Off Switch
C program to read and write raw data on SD card
a simple Astable Multivibrator with the help of a circuit diagram
Tube mic Connecting the capsule 2
Nickel-cadmium battery fast charger temperature control circuit