|
|
| Total Circuit and link web site |
| Motor, light and power control |
Black Light This circuit is a simple ultraviolate light that can be powered by a 6 volt battery or power supply that is capable of supplying 1 or more amps.. |
PWM Motor/Light Controller
A pulse width modulator (PWM) is a device that may be used as an efficient light dimmer or DC motor speed controller. |
|
Fan Control This is a simple circuit that will do what you want I believe.
R1 15k ohm resistor
NTC Thermistor- 10k ohm, sold at Radio Shack in the states. |
DC Motor Control Circuit Here, S1 and S2 are normally open , push to close, press button switches. The diodes can be red or green and are there only to indicate direction. |
Simple Servo Tester
This is a simple servo tester which will comprehensively test the capabilities of almost any modern servo |
|
Sound Level Indicator This project uses an LM3915 bar-graph IC driving two sets of ten LEDs for a 30dB range
|
| Dome Lamp Dimmer There are times when a little light inside the car would greatly assist one of the passengers but the dome light |
| |
220 Volts Flashing Lamps
This circuit is intended as a reliable replacement to thermally-activated switches used for Christmas tree lamp-flashing. The device formed by Q1, Q2 and related resistors triggers the SCR. |
Bicycle back Safety Light
This circuit has been designed to provide a clearly visible light, formed by 13 high efficiency flashing LEDs |
| Two-wire Lamp Flasher This circuit has been designed to provide that continuous light lamps already wired into a circuit |
Courtesy Light This circuit is intended to let the user turn off a lamp by means of a switch placed far from bed, allowing him enough time to lie down before the lamp really switches off.
|
Power Cuicuit |
Simple Adjustable Voltage Source A simple but less efficient methode of controlling a DC voltage is to use a voltage divider and transistor emitter |
LM317T Voltage Regulator with Pass Transistor
The LM317T output current can be increased by using an additional power transistor to share a portion of the total current. |
2 Cell Lithium Ion Charger This circuit was build to charge a couple series Lithium cells (3.6 volts each, 1 Amp Hour capacity) installed in a portable transistor radio. |
| 120 VAC Lamp Dimmer The full wave phase control circuit below was found in a RCA power circuits book from 1969. |
| |
Constant Current Battery Charger
A simple method of charging a battery from a higher voltage battery is shown in the circuit below to the left. |
| Light activete lelay This is same circuit as above with the addition of a photo resistor to trigger the flip flop instead of a push button |
| 12 Stage Neon Sequencer (NE-2 / NE-51) This circuit is similar to the LED clock using 12 neon indicator lamps instead of LEDs |
|
| Led Circuit |
| 40 LED Bicycle Light The 555 circuit below is a flashing bicycle light powered with four C,D or AA cells (6 volts). |
AC Line powered LEDs The circuit below illustrates powering a LED (or two) from the 120 volt AC line using a capacitor to drop the voltage |
| LED VU Meter The circuit below uses two quad voltage comparators (LM339) to illuminate a series of 8 LEDs |
| Analog Milliamp Meter Used as Voltmeter
A milliamp meter can be used as a volt meter by adding a series resistance. |
| Infrared Remote Control Tester This is a fairly easy circuit that can be used to test TV and VCR remote controls. |
| Transistor Schmitt Trigger Oscillator
The Schmitt Trigger oscillator below employs 3 transistors, 6 resistors and a capacitor to generate a square waveform |
Battery Equal Charge Indicator The circuit below illuminates an LED to indicate unequal charges between two 12 volt lead batteries
|
| Analog / Rf Circuit |
Decibel Meter The circuit below responds to sound pressure levels from about 60 to 70 dB |
Whistle On - Whistle Off
This is an extension of the CMOS toggle flip flop circuit shown in the "Circuits controlling relays" |
| Micro Power AM Broadcast Transmitter In this circuit, a 74HC14 hex Schmitt trigger inverter is used as a square wave oscillator
|
| 2nd Order Opamp Filters The figures below illustrate using opamps as active 2nd order filters |
Single Op-Amp Bandpass Filter
A bandpass filter passes a range of frequencies while rejecting frequencies outside the upper and lower limits of the passband
|
|
| Miscellaneous |
| Set/Reset Flip Flop This is an example of a set/reset flip flop using discrete components
|
| Bistable Flip Flop Here are two examples of bistable flip flops which can be toggled between states with a single push button |
| LINK ELECTRONICS WEB SITE |
| |
Circuit Archive - University of Washington Circuit Archive, lots of good circuits and links. |
| |
EDUCYPEDIA - The educational encyclopedia (Electronics section) |
| |
| |
| |
|
| |
| |
| |
| |
| Beyond Logic - Information on the PC Parallel, Serial and USB ports |
| How Stuff Works - Interesting site on how things work, but you will have to clear your screen of many pop up ads. |
| Deep Cycle Battery Frequently Asked Questions |
www.saroff.com Has some useful search engines for locating parts and data sheets.
|
| Commercial Electronic Sites, Kits and Projects |
TheLEDLight.com Luxeon LEDs, LED bulbs, fixtures, flashlights, lanterns, clusters, arrays, and more... |
lsdiodes.com Basic collection of bright LEDs in several colors at low prices. Brightness ranges from 4000 mcd to 12,000 mcd for the white LEDs |
| Microchip Technology Inc. (PIC) Controllers |
Mental Automation's products ECAD tools: schematic capture, printed circuit board design/layout, autorouting, circuit simulation, SPICE, and CD ROM Encyclopedia of Electronic Circuits, all running under Windows |
Express Printed Circuit Boards Download PCB software to layout your project, E-mail the resulting file and receive delivery of finished circuit boards via Federal Express in 3 working days. |
| PCB Express 1-Day Delivery, Economical, Easy to order and track, Lot charge as low as $80, E-Mail Help |
C. Crane Company LED Flashlights, windup radios, and other specialty items.
|
| ELECTRONIC EDUCATION SITE |
| |
| |
Play Hookey Basic ideas about op-amps, analog circuits, optics, computers and digital logic. |
| |
|
|
Books Topics 
