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Various Power Control Delay Circuits - Uses the LM555 timer or its cousins with other letter prefixes. There can be minor
differences between 555 timer IC's from different manufacturers but they all should be useable for any circuit.
Designed for Model Trains. . . . [from Rob Paisley's Model Train web site]
VCXO Makes Inexpensive Dual-Clock Reference - 11/27/03 EDN Design Idea This Design Idea describes an inexpensive circuit to generate
two extremely high-quality, crystal-clock-reference-signals, one of which is a PWM-controlled VCXO
(voltage-controlled crystal oscillator] clock signal (Figure 1). The desi. . . [by Said Jackson, Equator
Technologies Inc, Campbell, CA]
Versatile
CMOS/TTL Logic and Clock Probe - For fault diagnosis of
any logic circuit, you need a probe that can test the logic level or existence of clock activity. The circuit
shown here can be used to test CMOS and TTL logic circuits for logic states and also for the presence of clock
activity from a few hertz to more than 10 MHz, at any point of the logic circuit. . . . [© EFY Enterprises Pvt.
Ltd. All rights reserved.]
Versatile electronic timer - . . .
Versatile
Object Counter - Here is a simple circuit that can count
objects without using any costly microcontroller. The circuit is good for those who are not familiar with
programming of microcontrollers. . . . [© EFY Enterprises Pvt. Ltd. All rights reserved.]
Versatile Timer Operates from Microseconds to
Hours - Application Note 24 Feb1999. . . [National
Semiconductor]
Versatile Timer IC - an 8-pin pic generating hourly/daily pulses, saves lots of circuitry - example circuits
also. . . [by P. Townshend - EduTek Ltd]
Very Stable 40kHz Generator -
ASCII format-A circuit that I have used before is based on the CD4060 (14stage binary counter) and a 640Khz
ceramic resonator. The CD4060 is basically an oscillator and a ripple counter to divide the 640khz down to
something more usable. . . .
VFD (vacuum flourescent display) clock - This is my fifth retro display clock (others: 1, 2, 3, 4), but the first based on a vacuum
fluorescent display. Let's get right down to it. . . . [© 2007 by Riad S. Wah[by]
Video Clock Superimposer - As a followup to my VCR Pong project, here is a gadget that is actually useful in the Real
World! It superimposes the time of day, in "HH MM SS" format, in the bottom right-hand corner of an existing
video signal. My friend Scott uses it with his home security system. . .
Video clock superimposer using PIC16C711 - As a followup to my VCR Pong project, here is a gadget that is actually useful in the Real
World! It superimposes the time of day, in "HH MM SS" format, in the bottom right-hand corner of an existing
video signal. My friend Scott uses it with his home security system. . .
Visitors
Counter - Presented here is a simple counter that counts
the number of visitors entering or exiting an auditorium or any other place where you have installed this circuit
at the gates. On receiving an interrupt from light-dependent resistor (LDR) sensors, the circuit increments the
count and shows it on a 7-segment display. . . . [© EFY Enterprises Pvt. Ltd. All rights reserved.]
Voltage Controlled Oscillator with 16:1 Frequency
Range - The LTC6990 is a precision silicon oscillator with
a programmable frequency range of 488Hz to 2MHz. It can be used as a fixed-frequency or voltage-controlled
oscillator (VCO). The LTC6990 is part of the TimerBlox family of versatile silicon timing devices. A single
resistor, RSET, programs the LTC6990’s internal master oscillator. . . [Linear Technology App Note, Jun 16th
2010]
Voltage Controlled Pulse Width
Oscillator - Uses the LM555 timer or its cousins with
other letter prefixes. There can be minor differences between 555 timer IC's from different manufacturers but
they all should be useable for any circuit. Designed for Model Trains. . . . [from Rob Paisley's Model Train web
site]
Voltage Controlled Switch
using 555 - In this circuit the 555 timer is used in a
novel way, as a voltage controlled switch. . . . [Circuit designed by Miroslav Adzic]
Voltage Doubler - A voltage higher than the supply can be created by a "Charge-Pump" circuit created with a
555, diodes and capacitors as shown in the following circuit. The output will deliver about 50mA. . . . [No
designer name given]
Wailing Siren - By pressing the button, the wailing sound increases. Releasing the button decreases the
wailing. The circuit automatically turns off after about 30 seconds. . . . [No designer name given]
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