Human Sensing Circuits

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10Mhz-frequency-counter
Constant Current Source LED Drive
Data logging with an EEPROM
usb audio multiplexer
simple water level buzzer circuit
Stereo preamplifier with tone control
PS10 Quad Power Sequencing Controller - Supertex Inc
facelift for the 7MHz TRX
DC Power Supply 9 volt using TIP31 transistor
Ultrasonic Sensor Circuit
ASTABLE BLOCKING OSCILLATOR
JFET-Bipolar Cascode
Pressure Transmitter Data Acquisition System circuit 1B31,18 bit A / D converter AD1170 and MCS-51 microcontroller



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