Circuits & Schematics: CHESS CLOCK - 6

51. Compact, Four-Quadrant Lock-In Amplifier Generates Two Analog Outputs
    Marco Girolami Stefano Salvatori
    Circuits Theory Analog Devices AD630
    .. 0 and 90 reference signals in Figure 1. Counter 1 measures the reference-signal time in terms of the N number of digital clock pulses, where the reference time can be different from 50%. It receives a preset command at the N 1 =1 value at ...
    Dec 24, 2009

52. An Experiment to Build a PCI Board
    Circuits Computers and Peripherals Digital
    .. This is the simplest bus cycle. Target devices detect the start of the bus cycle by the FRAME# is asserted at the second clock. At a bus cycle is initiated, the bus comand and the address is taken in to each target device attached to the ...
    Jun 17, 2009

53. Deogen - Tiny Monitor Tester
    Circuits Monitors ATTiny2313
    .. from Atmel, having the advantage of increased speed (20MHz) and several instruction set improvements (especially single clock port toggle instruction) over the previous versions (AT90S2313). Synchro H and Synchro V signals are driven ...
    Jun 18, 2009
54. Automatic Room Lights
    Circuits Domestic Light
    .. Thus green LED portion of bi-colour LED is lit momentarily. The same output is also coupled to IC3 for which it acts as a clock. With entry of each person IC3 output (high state) keeps advancing. At this stage transistor pair T3-T4 cannot ...
    Jul 1, 2009
55. Use an LED to sense and emit light
    Circuits Light Altera EMP240
    .. than 47% without affecting appearance. Figure 1 shows a circuit that uses an Altera EMP240ZM100C7N CPLD, LED, resistor, and clock source to blink an LED with an intensity proportional to ambient light. The circuit comprises a PWM ...
    Jul 13, 2009
56. Nite Rider Lights
    Circuits Automotive Light
    .. LED's 1 to 9. 1 9V PP3 Battery. 1 single pole switch SW1. 1 Box. How The Circuit Works. IC4, C1, R1 and R2 are used for the clock pulse which is fed to both the counters IC2 and IC3 Pin 14. IC1 is a Flip Flop and is used as a switch to ...
    Aug 18, 2009
57. Scalable Noise Generator
    Circuits Oscillators
    .. itself is composed of two parts: 1) a 16-bit sequence generator followed by a 12-bit parallel A/D converter. The 100Khz clock is derived from a 555 timer. At turn on, the spare XOR gate is used to force some 1's into the shift ...
    Dec 11, 2009
58. The Witness camera. Part 2
    Circuits Security Microcontrollers Usage
    .. does a good work at simplifying hardware access. For small applications, it’s a time saver. Do you need a real time clock? Just tell the compiler, and he will do the hard work of making timer interrupt code specific to the AVR ...
    Mar 4, 2010
59. Infra Red Switch
    Circuits Domestic
    .. a bistable. Any version of the 7474 may be used, i.e. schottky 74LS74, high speed 74HCT74 etc. The input is applied to the clock pin, the inverted output fed back to the data input and clear and preset lines are tied to ground. For every ...
    Jan 30, 2010
60. Four Channel PWM Controller. Part 1
    Circuits Microcontrollers Usage
    .. effects. To prevent this, the ‘Fast PWM’ mode of timer operation within the ATMega32 was chosen, with no clock prescaling, and a clock frequency of 8MHz. This results in a final PWM frequency of 31.25kHz, well above human ...
    Feb 1, 2010

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