Circuits & Schematics: CHESS CLOCK - 10

91. Dot matrix LED running display. Part 2. Construction.
    Circuits Microcontrollers Usage
    .. controls); Direct buttons from 0 9 selects predefined messages. From messages 1 to 4 display will show static message of clock, date, outside and inside temperature, respectively. From 5 to 9 and 0 the display shows all available data ...
    01-02-2011

92. Multi-brightness LED controller draws zero off-current
    Circuits Supply Light Texas Instruments CD4017B TL431
    .. At this time, the Q0 output from pin 3 sets the LED brightness to 25% as determined by R14 (Figure 2). Each push feeds a clock pulse to IC2.14, which increments the count. The second push makes Q1 go high, with R15 now setting the second ...
    10-08-2017

93. Ten-Cent Charge Pump Provides LCD Bias
    Circuits Supply Power
    .. bias voltage using signals already available in the design. The MSP430 allows a pin configuration that output its internal clock signals, which derive from a 32.786-kHz crystal. This signal drives a very simple charge pump. An ac-coupled ...
    09-03-2011
94. Heart rate measurement from fingertip. Part 2. Software
    Circuits Medicine Microcontrollers Usage
    .. Project: Measuring heart rate through fingertip Copyright @ Rajendra Bhatt January 18, 2011 PIC16F628A at 4.0 MHz external clock, MCLR enabled */ sbit IR_Tx at RA3_bit; sbit DD0_Set at RA2_bit; sbit DD1_Set at RA1_bit; sbit DD2_Set at ...
    14-03-2011
95. Switched-Capacitor-Based Bandpass Filter Boasts (Nearly) Rectangular Shape
    Circuits Analogue Design Linear Technology LTC1068
    .. sharp rolloff, but the passband is too narrow for a typical application. The filter center is 50 times the center-frequency clock and, according to the datasheet, can differ by 0.9% from the calculated value. If we allow the filter pass area ...
    02-08-2018
96. Turn DDS Chip Into Low-Frequency Arbitrary Signal Generator
    Circuits Measurement AD9833
    .. to accept continual register updates (the first four bits define the register address), so every 16 bits of the serial data clock loads a new value into the phase offset register. Therefore, after resetting the device to zero the phase ...
    06-04-2011
97. Capacitive Proximity Sensor Provides Accuracy And Speed
    Circuits Security
    .. arrive at the C-input of U2 very slightly later than they arrive at the D-input. With this setting, the rising edges at C clock the already high signal at D into the flip-flop. The Out signal will thus normally remain at logic high. When a ...
    11-04-2011
98. Bootstrapping allows single-rail op amp to provide 0V output
    Circuits Analogue Design Supply Linear Technology LTC1150
    .. scheme achieves the desired characteristics with minimal parts count. IC 1 , a chopper-stabilized amplifier, features a clock output. This output switches Q 1 , providing drive to the diode-capacitor charge pump. The charge pump's ...
    04-02-2021
99. Use An On-Chip UART To Detect An Edge-Triggered Interrupt
    Circuits Microcontrollers Usage
    .. (that is, a low-going edge in the input signal), the UART interprets this as the arrival of a start bit. The baud-rate clock goes on sampling the input and senses a byte value of 0x00 with a “break error” bit set. The error ...
    11-05-2011
100. Crystal Oscillator Features Low Current, Low Startup Voltage
     Circuits Oscillators
     .. battery life. The low starting voltage was originally designed to allow a minimum battery life of one year in a particular clock design. The circuit shown was patented (No. 5,220,291), but the patent has expired. The oscillator features a ...
     19-05-2011

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