Timers and Counters Circuits, page 30

Timers and Counters Circuits

Timers & Counters: #'s - A B - D E - L M - S T - Z

Last Updated: November 29, 2017 05:37 AM

Circuits Designed by Dave Johnson, P.E. :

Service Request Beeper - A single press of a pushbutton switch turns on a beeper for one second but can’t be activated again for 60 seconds. . . . [Hobby Circuit designed by David A. Johnson P.E., 09/25/05]

Links to electronic circuits, electronic schematics, designs for engineers, hobbyists, students & inventors:

Scalectrix Lap Timer - Works by using an LDR under the track, times alternate laps in 10ths of a second. . . [by P. Townshend - EduTek Ltd]

Scan Bridge STA111/STA112 Timing - Application Note. . . [National Semiconductor]

Schematic & Layout Guidelines for PI6CV304/PI6CV2304 - Application Note # 054. . . [Pericom Semiconductor]

Scheme provides automatic power-off for batteries - 05/13/04 EDN Design Idea The circuit in Figure 1 provides a simple and inexpensive way to protect one of the most valuable components in portable applicationsthe battery. Applications include all portable equipment that requires a limited time of operati. . . [by Miguel Gimenez, Altair-Equipos Europeos Electronicos, Madrid, Spain]

Scheme speeds access to µP's real-time clock - 06/05/98 EDN Design Idea (Page contains several design ideas, please scroll to find this one) The DS5000T (Dallas Semiconductors, www. dalsemi. com) is an 8051-compatible processor that integrates nonvolatile memory and a real-time clock. This module has an impressive set of functional extensions and security features, which makes it particularly useful for all-in-one embedded systems. Unfortunately, access to the real-time clock is complicated and thus inefficient. . . . [by Jerzy Chrzaszcz, Warsaw University of Technology, Warsaw, Poland]

Schmitt Trigger - Can also be called AN INVERTER or a SCHMITT INVERTER. We have animated the circuit to show how the output goes high or low according to the input level. The animation shows a wide gap between the input levels. . . . [No designer name given]

School/College Quiz Buzzer - Manual buzzers used for quiz competitions in schools and colleges create a lot of confusion in identifying the first respondent. Although there are circuits using PCs and discrete ICs, they are either too expensive or limited to only a few number of players. . . . [© EFY Enterprises Pvt. Ltd. All rights reserved.]

Science of Timekeeping - Application Note. . . [Aligent]

Screamer Siren-Light Controlled - This circuit will produce an ear-piercing scream, depending on the amount of light being detected by the Light Dependent Resistor. . . . [No designer name given]

SDRAM Modules using Pericom's Products - Application Brief # 015. . . [Pericom Semiconductor]

Self-powered Sine to Square wave Converter - . . . [by IQ Technologies Industry, unless otherwise noted online]

Sequential Timer - This timer will provide a sequence of up to ten separate events. The length of each event is set independently. And the sequence will run a fixed number of times, or repeat continuosly. The individual events within the sequence, can be made to repeat and/or overlap. The accompanying Support Material includes a detailed description of how the Cmos 4017 works. . . . [Circuit by Ron J.

Serial or Sequential Timing - 09/26/96 EDN Design Idea In this design, you can adjust as many as eight time intervals, and repeated operation is optional. You can use the timer to control the external load either serially or sequentially, depending on the application. The basic timer uses a 4060 (IC4) with a fixed timing capacitor. The analog switches connect the timing resistors to the circuit. A five-stage Johnson counter, IC1, controls the analog switches. . . . [by Sanjay R Chendvankar, Tata Institute of Fundamental Research, Bombay, India]

Service Request Beeper - A single press of a pushbutton switch turns on a beeper for one second but can’t be activated again for 60 seconds. . . . [Hobby Circuit designed by David A. Johnson P.E., 09/25/05]

Servo Controller - This circuit can be used to manually turn a servo clockwise and anti-clockwise. By pushing the forward or reverse button for a short period of time you can control the rotation of the servo. . . . [No designer name given]

Servo Motor Test Circuit (LM555) - This circuit while crude is an inexpensive way to drive or test servo motor systems without the need for a compete system. Circuit for model railroad trains. . . . [from Rob Paisley's Model Train web site]

Servo Tester - This circuit can be used to manually turn a servo clockwise and anti-clockwise. By pushing the forward or reverse button for a short period of time you can control the rotation of the servo. It will also test a servo. . . . [No designer name given]

Shot Clock 24 Second Timer - This is a circuit intended to be used in basketball shot clock. . . . [Circuit designed by Milano de Guzman]

Shower Stopper - The shower stopper is a project suggested by one of the readers of the Technical Library. His request was for a circuit that would activate a solenoid to shut off the hot water to the shower after a reasonable length of time. It seems that certain members of his household enjoy long, warm showers. This circuit is probably sadistic! The circuit detects when the hot water is turned on in the shower by means of a. . . [Copyright © 1998 Wenzel Associates, Inc.]

PAGE Next>>>>

Timers & Counters: #'s - A B - D E - L M - S T - Z