Vacuum Tubes Valves
Musical & effects
Yagi Uda Antennas
Metal Detector Circuits
Liquid Sensing Circuits
Light Sensing Circuits
Voltage Detector Circuits
Air-Gas Detection Circuits
Human Sensing Circuits
RF & Radiation
Optical Sensing Circuits
Free Energy Circuits
AC to DC & DC to DC
Solar Cell Circuits
Micro Power Circuits
Switching Power Supplies
Light Laser LED
Digital to Analog
Analog to Digital
Data Bus Circuits
Voltage to Pulse
Current to Voltage
Frequency to Voltage
RF Converter Circuits
Sine to Square Wave
Voltage to Current
voltage to frequency
Period to Voltage
Video Wall circuits
TV Video Circuits
Motor Control Circuits
8051 / 8052
PCB CAD Software
Car bike Circuits
555 Timer Circuits
Remote Control Toy
H Bridge Circuit
Interconnection & Timing
Digital Signal Integrity
Digital & Bipolars
Sensors & Detectors
Regulated Power Supply
4 Band Resistor
5 Band resistor
6 Band resistor
Car Bike Circuits
Car Bike Circuits
OBD II Car Computer
Using the OBD-II (On Board Diagnostics) protocol, we can read live information from a car`s computer with our NerdKits microcontroller kit, as explained by our guest star, Elena T. , MIT class of 2011. This uses the port under your steering wheel to receive all kinds of information, and is used by auto mechanics for troubleshooting the "Check Engi
12V 60A car battery
The battery should charge up to 14 volts. A reading of 10. 7 volts indicates that one cell is shorted. A good way to diagnose this further is to look at the water level in the cells. The shorted cell will bubble more vigorously and lose water faster than the others when it is on the charger. As far as I know there is no way to fix a shorted cell ot
Bicycle alarm electronic project
This is a project that I undertook during June 1996 as my final year electronics project. The entire circuit was built using individual components including logic gate ICs and and keyboard decoder IC. Since them electronics has moved on and if this was created today most of the functionality would instead be implemented using a microprocessor / mi
Simple bike computer tutorial
The PCB we have made is big and has plenty of space for cutting and adding other bits and pieces. But if we want the final satisfaction of seeing it working, mounting the lot on a real bike, it is a bit too big. Way back in chapter one, we discussed sensors and I recommended we should stay with the herd and use some sort of hall device. Well now w
Bicycle Radio easy and cheap to build (April 1940)
This article by Arthur C. Miller was issued on page 88 to 90 in the book "Radio For The Millions" (prepared in 1945 by Popular Science Monthly staff, but first published in "Popular Scienece Monthly" April 1940). Fans who would like to install a radio on their bicycles so they can enjoy their favorite programs while riding around town or on short
basic motorcycle wiring
Customs by Ripper - Tech page about basic wiring for any vehicle, but motorcycles in particular..
Kit Car Design & Build
The plumbing is done and the fuel system is done. Final checks on the electrical system are under way. More tidying up and testing of the bike loom. Nearly there. I`ve got onequery though. My 2003 loom has two unused connectors for an alarm system. To me, these appear to have to be connected to something in order for the rest of the loom to work...
Radio control car receiver principle circuit diagram
Here is the diagram of radio controlcarreceiverprinciple circuit. Notes:The choice of transistor Q1 and the bias resistorQ1 1815 9018R1 240K 100K The choice of the high-frequency parameters partFrequency C1 C2 L227M 35P 30P 10uH35M 30P 30P 8.2uH40M 30P 20P 5.1uH49M 20P 15P 3.3uH The production method of L1In the diameter of 5mm, use Enameled...
Car alarm circuit diagram
Motorcycle anti-thief alarm circuit (11)
The principle of the circuit The motorcycle anti-thief alarm circuit is composed of the detection alarm circuit, the charging circuit and the anti-theft control circuit, this circuit is as shown in figure 7-94. The detection alarm circuit is composed of the mercury switch Sl, the resistors Rl-R3, the capacitor C, the transistors V1, V2 and the...
Motorcycle anti-thief alarm circuit (8)
The principle of the circuit The motorcycle anti-thief alarm circuit is composed of the anti-theft detection circuit, the control circuit, the sound generator, the audio oscillator and the power amplifier output circuit, the circuit is as shown in figure 7-91. The anti-theft detection circuit is composed of the piezoelectric vibration sensor BC,...
Automotive electronic password lock circuit diagram
Automotive electronic code lock circuit is shown as above. ICl is exclusive lock for the integrated circuit 5G058, its ? ~ ? feet connect external key switch to the power supply. They are six valid input keys. The unlock must follow the sequence of Sl ~ S6; pin ? button switch S7 is connected to the false key input. It is free to pick one or a...
The motorcycle anti-theft alarm (3)
The motorcycle anti-theft alarm which uses the 555 time-base integrated circuit is introduced in this article, and it can send out the alarm when the thief is moving the motorcycle vertically. The principle of the circuit The motorcycle anti-theft alarm circuit is composed of the trigger circuit and the alarm circuit, as the figure 7-85...
The motorcycle anti-theft alarm (4)
The motorcycle anti-theft alarm is introduced in this article, it uses the private displacement sensor and has the features of high sensitivity, good reliability, low false alarm rate and easy to make. The principle of the circuit This motorcycle anti-theft alarm circuit is composed of the integrated vibration displacement sensor (it is composed...
Free energy Bicycle lights
This bicycle safety flashing light system is based on a newly invented electrical generating system, NO battery needed, No friction on any parts of the bicycle. No drag. get the energy almost free (at least on bicycle). Very bright. Standby light..
BIKE SPEEDOMETER CIRCUIT
The proximity detector senses the passing of the PC board pieces as the wheel rotates, providing an output signal, which has a clean transition between high and low voltage levels, and is ideal for triggering counting or processing circuits. Next is the frequency-to-voltage converter, and, because a reasonable degree of accuracy is required, the...
36V electric car battery charger circuit diagram
Motorcycle charging circuit diagram
The circuit uses ACpositive half cycle charge. Charging speed is fast and it can extend battery life. People use the charger on ordinary motorcycle. It has an excellent performance and saves 5% fuel. It is a practical charging circuit. Working principle: (shown as the figure)AC voltage is also added to the D1 and SCR. It passes the half-wave...
Intelligent pulse electric bicycle charger principle diagram
Voltage driving type pulse width modulator 1. feature and function of TL494 TL494 is produced by the United States IR company. It is voltage driving type pulse width modulator, which can be used as switching power circuit in display, computer and other system circuit. The output triode of TL494 can connect to the mode of common emitter or...
Car audio power supply DC-DC converter circuit diagram
The LED car voltmeter (2)
Here is to introduce the LED car voltmeter which is made of the op-amp LM312 and LED, it can display 6 gears of voltages, 10-15V, each gear is 1V. The working principle of the circuit The LED car voltmeter consists of the regulator circuit, Vref circuit, sampling voltage circuit and LED display drive circuit, see as figure 7-76. The regulator...
The LED car voltmeter (3)
The LED car voltmeter consists of the filter circuit, voltage distribution filter circuit, voltage amplifier circuit and LED display circuit, see as figure 7-77. The regulator filter circuit consists of the 3-terminal IC1 and filter capacitor C1. The voltage distribution filter circuit consists of the resistors
Electric car remote control circuit diagram
The electric car remote control circuit diagram not only can make the model car move forward and backward, but also turn left and right turn, it is simple, easy to operate. Radio remote control receiver demodulation circuit uses TWH9238 components, the matching remote control transmitter component is TWH9236. This can be used for learning and...
Radio remote control car sending schematic diagram
Car Tachometer with 555 IC
Pulses are received by the timer from the distributor points. When the timer output is high, Meter M receives a calibrated current through R6. The meter don`t..
Voltmeter With LED For Car Battery
Below is a comparator circuit which is can measure with step of 1 volt, the voltage of car battery. The indication of voltage is done by comparison of ..
Animated LED for Bike Turning Signal
Using circuit below, we can animate the bike turning signal using LED. The bike turning signal will blink from the right side (D1) to the left side (D5) in a..
Car Interior Light Extender
Below is a Courtesy Light Extender for cars. When a door is closed in a car, it extends the ON time, so the passenger can see where he/she is sitting. Here is..
Delayed Car Door Alarm
Opening car`s door is very simple activity, and off course it`s just a daily activity which require no special skill. Almost nothing can go wrong, but..
Vincent Motorcycle Electrics
This diagram shows a redundant - closed loop ground wiring system. This is intended to reduce dependency on the frame for ground purposes in the charging circuit. The second (lower) diagram is as the bike was built using the 12 volt Alton generator and an Alton supplied rectifier/regulator. It is a bare bones diagram. Within 2 years, the Alton...
Automotive Alarm Circuits
Car Lighting Circuits
Car Parking Aid Circuits
Car Audio Circuits
Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
Digital Signal Integrity
Interconnection and Timing of Digital Circuits
CMOS Circuits Tutorial