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LED Clock with Timer & Solar Panel
Regulator - This is a combination digital clock timer
and solar panel charge controller used to maintain a deep cycle battery from a solar panel. The timer output
is used to control a 12 volt load for a 32 minute time interval each day. Start time is set using 9 dip
switches and ends 32 minutes later. The 32 minute duration. . . [Bill Bowden, designer]
LED display Digital Voltmeter - This digital voltmeter is ideal to use for measuring the output voltage of your DC power
supply. It includes a 3. 5-digit LED display with a negative voltage indicator. It measures DC voltages from
0 to 199. 9V with a resolution of 0. 1V. The voltmeter is based on single ICL7107 chip and may be fitted on a
small 3cm x 7cm. . .
LED Flasher - Flasher uses LM3909 IC. . . [Tony van Roon's circuit]
LED Relay Timer - This circuit provides a visual 9 second delay using a 7 segment digital readout LED. When
the switch is closed, the CD4010 up/down counter is preset to 9 and the 555 timer is disabled with the output
held high. When the switch is opened, . . . [Bill Bowden, designer]
LED Voltmeter - Measures voltages up to 199. 9V with 0. 1V resolution. . .
Level Shifters: Why We Can't Shift
Away - Application Note # 066. . . [Pericom
Semiconductor]
Li-Ion Charger - PIC Project Lithium Ion batteries pack a lot of power by weight compared to other types.
There are 2 things that need to be handled differently than NiCad on NiMH:. . . [Luhan Monat - Mesa Arizona]
Limiting Amplifier is
digitally programmable - 06/05/98 EDN Design Idea
(Page contains several design ideas, please scroll to find this one) Amplitude limiters are necessary in
many systems, such as radar and FM receivers, for which the system cannot allow the Amplitude of the signal
to exceed the given positive, negative, or both limits. In the circuit in Figure 1, Amplifier IC4B's maximum
output is digitally programmable over ±2 to ±10V in 2n steps, where n is the number of bits of the DAC. IC1,
a precision 10V reference, provides a full-scale reference current, IREF=VREF/R1=2 mA, to IC2, a multiplying
DAC. . . [by V Manoharan, Naval Physical and Oceanographic Laboratory, Kochi, India]
LIN Protocol Implementation using Picmicro® Mcus - Application Note Published 4-Feb-00. . . [Microchip]
Line Reversal Using
A PIC16c509scroll to find this circuit #4- If a
device is connected between two output lines as shown in fig: 5, a program can be written so that the device
sees a voltage reversal. When one output is HIGH the other is LOW and this is then reversed. . . [Prepared by
Colin Mitchell]
Linear Circuits for Digital Systems - AN31 Subtitled "Some Affable Analogs for Digital Devotees, " discusses a number of analog
circuits useful in predominantly digital systems. VPP generators for flash memories receive extensive
treatment. Other examples include a current loop transmitter, dropout detectors, power management circuits,
and clocks. . . [Linear Technology]
Litter Box - PIC Project Not every new use of technology requires a microcontroller. This one uses a 12
volt computer fan from CompUSA, a snap close food box from Walmart, some PVC pipe from Home Depot, and a
large plastic storage container from Big Lots. . . [Luhan Monat - Mesa Arizona]
Live Insertion in High Speed Data
Communications using 3.3V Bus Switches - Application
Brief # 031. . . [Pericom Semiconductor]
LM3909 replacement information - This page features a replacement circuit for the LM3909 LED Flasher / Oscillator. The
replacement circuit uses discrete components and is essentially the same as the internal circuit of the
LM3909. . . [from Rob Paisley's Model Train web site]
LM628 Programming Guide - Application Note. . . [National Semiconductor]
Logic analyzer pushes microcontroller to its limit - 12/07/00 EDN Design Idea Simple logic-analyzer design is compatible with all versions of
Windows and pushes the PIC 18C252 chip to its speed limit to achieve a 1-MHz sampling rate (Figure 1). The
circuit. PDF contains multiple circuits, scroll to find this. . . [by Tom Lyons Fisher, Inexpensive Systems,
Huntingdon, PA, and Michael Deskevich, Juniata College, Huntingdon, PA]
Logic circuits using discretes - There have been many times when I've been designing machinery controls where I have needed a
logic function but only one so it's not worth using a quad logic gate. Here are some of the ways I use. Look
carefully at them and you may gain a new perspective on logic and truth tables!. . . [Page's Author: Richard
Torrens]
Logic Family Voltage Translation - how to translate between TTL, 74xx, CMOS, ECL, PECL, Low Voltage TTL, LVTTL, etc. . .
Logic
'high'/'low' Indicator - This logic 'high'/'low'
indicator circuit comprises two ICs. One is hex inverter IC 7404 (IC1) and the other is a bistable
multivibrator built around timer IC 555 (IC2). A logic probe is connected to the first inverter (N1) through
potmeter VR1, while the output of the second inverter (N2) goes to the common point of trigger pin 2 and
threshold pin 6 of IC2. . . [© EFY Enterprises Pvt. Ltd. All rights reserved.]
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