Circuits & Schematics: CHESS CLOCK - 4

31. Audio Spectrum Monitor
    Circuits Audio Microcontrollers Usage
    .. up to 61(H) x 32(V) dots and they drive half of the LCD panel each. SG12232C requires a 2 kHz square wave as LCD drive clock and it must be supplied during power is on or the LCD panel may be damaged due to static bias. The bus ...
    29-10-2007

32. Talking Time and Temperature Display with the CCS C Compiler
    Circuits Measurement Domestic
    .. fun time putting this particular project together, and I hope you do too. This project shows how to build a talking clock with time temperature display + it includes several handy C functions you may find useful for other embedded ...
    30-10-2007

33. Injection-lock a Wien-bridge oscillator
    Circuits Oscillators Analog Devices LT1468-2 LTC2361 LTC6255
    .. was purely analog and had no “10-MHz reference input” on the back to allow it to be synchronized with the ADC clock. The result is substantial spectral leakage in the FFT, so that it looks more like a circus tent than a single ...
    07-05-2020
34. CPLD Connects Two Instruments With Half-Duty-Cycle Generator
    Circuits Digital Oscillators
    .. for other system triggering. The half-duty-cycle generator fits into a CPLD, such as an Altera EPM570 with a 60-MHz system clock and an MM74HCT244 buffer to output a TTL signal. Listing 1 contains the program for the CPLD .
    17-12-2007
35. Microcontroller's Single I/O-Port Line Drives a Bar-Graph Display
    Circuits Microcontrollers Usage
    .. To light N segments of a display that is M segments long, the first output port sends M N pulses to the shift register's clock input. This design lends itself well to situations in which unused I/O-port lines are at a premium, as is the ...
    18-12-2007
36. Envelope Follower Combines Fast Response, Low Ripple
    Circuits Supply TL072
    .. voltage results. To ensure that one of the detectors holds the highest peak value for the entire input period, the reset clock period is slightly longer than one-half the period of the lowest input frequency. Figure 2 illustrates typical ...
    22-01-2008
37. Versatile Digital Speedometer Uses Few Components
    Circuits Measurement Domestic
    .. and distance traveled, and displays the results on the LCD. One of IC1's internal timers, Timer0, increments after every N clock pulses. Distance traveled equals 2πR, where R is the wheel's radius. To calculate speed, IC1 divides the ...
    14-11-2007
38. The Wooden Menace - a Mighty Robotic Arm Powered by Servos
    Circuits Microcontrollers Usage Robots
    .. The routine seen in the code is called a 'Bit Banging' procedure. 'Bit Banging' is when you simulate the clock through your own digital device to get the given input. A standard SPI could have been used with much more ...
    10-03-2008
39. Morse Code Beacon Keyer
    Circuits Radio Microcontrollers Usage
    .. be used to select the upper or lower message. Click for unlarge Theory CMOS Nor gates U1c and U1d form a gated astable clock oscillator, the frequency can be adjusted by potentiometer VR1. Gates U1a and U1b form the run/stop flip-flop. ...
    16-11-2008
40. SPI Interface Big 7-Seg LED
    Circuits Microcontrollers Usage Light 74HC595
    .. for receiving serial data from uController board. See example of U5 in the schematic, SER is for data input, SRCLK is shift clock and RCLK is Latch clock. Each data bit is shifted into the register on rising edge of the shift clock. When all ...
    31-03-2008

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