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
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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
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8051 / 8052
PCB CAD Software
Car bike Circuits
555 Timer Circuits
Remote Control Toy
H Bridge Circuit
DIY HV Variable Cap
DIY PMA alternator
Interconnection & Timing
Digital Signal Integrity
Digital & Bipolars
Sensors & Detectors
Regulated Power Supply
4 Band Resistor
5 Band resistor
6 Band resistor
Meter Counter Circuits
Counter Demodulates Narrowband FSK Without Synchronization
Frequency shift keying (FSK) is a popular digital modulation technique for data transmission. Some common applications of FSK modulation include both wired and wireless data transmission as well as infrared remote controls for consumer electronic equipment. FSK demodulation can be either coherent or noncoherent. Coherent detection always demands...
alphanumeric lcd as counter
The communication technique with the LCD is the same like the last lesson, and for the current experiment we have added a counter which counts between 0000 and 9999. Our counter increments with 1 second delay. /* ` * ` Lesson nr. 16: ` Alphanumeric LCD as counter mode. ` Done by: ` Aureliu Raducu Macovei, 2010. ` ` In this exper
Frequency Meter / Frequency Counter 10Hz-60MHz
60MHz Frequency Meter / Counter measures frequency from 10Hz to 60MHz with 10Hz resolution. It is extremely useful bench test equipment for testing and measuring frequency of oscillators, transmitters, radio receivers, function generators, crystals, etc. Counter provides exceptionally stable readings and has excellent input sensitivity thanks to o
controller 4017 counter LEDs have multiple connections in this traffic light circuit
Why are four legs connected to the green LED and two to the amber LED in the 4017 traffic light circuit Shouldn`t it be able to do with only one leg per LED Each output is consecutively active for the same time. By wired-OR-ing outputs you can create longer active times. So the green LED will be on during 4 time units. Normally you would have to
oscillator HEF4060B counter doesnt count
The first problem is with the 16Mhz xtal the thing doesn`t even start to oscillate. But that`s a secondary problem. If I replace 16MHz xtal with a 11MHz one (or less) the oscillator starts. I can see with the `scope that I have a nice 11Mhz sinusoidal waveform on the pin 11, and I see a not-so-nice square-ish waveform on the pin 9 (so, I imagine t
Simple counting can be done by anyone but counting in interval up to large number is tedious and the chance of forget is maximum. As, we have already published Counter Circuit | Digital Counter. Now, here electronics counter is second project by dreamlover technology in the series of counting based project. Bothe the counting circuit published i
Electronic counter circuit
150-Hz Oscillator/Counter Circuit. Simplified Schematic Diagram
150-Hz Oscillator/Counter Circuitt Card Schematic Diagram (Assembly A21)
AT89C2051 Digital Visitor Counter
AT89C2051 Digital Visitor Counter. The microcontroller do the above job it receives the signals from the sensors..
Automatic Room light Controller with Visitor Counter (AT89S52)
This Project Automatic Room Light Controller with Visitor Counter using Microcontroller is a reliable circuit that takes over the task of controlling the room lights as well us counting number of persons/ visitors in the room very accurately. When somebody enters into the room then the counter is incremented by one and the light in the room will b
Timers and Counters in AT89S52
Diagram below shows a simplified diagram of the main peripherals present in the 89S52 or 8052 / 8051. There are 3 Timers/Counters in the 89S52. The expression "Timer/Counter" is used because this unit can act as a Counter or as a Timer as per requirement. Timer/Counter 2 is a special counter that does not behave like the two others, because of some
This article is about the term counter used in electronics and computing. For other uses, see Counter (disambiguation). In digital logic and computing, a counter is a device which stores (and sometimes displays) the number of times a particular..
Decimal Counter Using Two 7-segment displays and an 8051
The purpose of this lab is to implement a decimal counter which counts from 0 to 99. You will have to write a C program for the 80X51 micro-controller. You will then compile your C program using C51 compiler and burn it unto an 8051 stand alone chip. You will also have to do some wiring in this lab. The 8051 chip requires some connections to funct
This experiment has two main objectives. First, we will become familiar with the characteristics of the Geiger-MG ller (GM) tube, including the properties of threshold, starting and operating voltages, GM plateau region and plateau slope. Then we will use the GM tube to perform a simple statistical experiment for the purpose of studying some of th
Digital Decade Counter Schematic
Decade counter circuit is a electronic circuit to perform a sequence of numerical calculations either forward or backward calculation. What is meant by forward calculation is where the circuit will count ranging from small numbers to larger numbers. While the countdown to the contrary. Calculations can reach an unlimited number of circuit
50MHz frequency counter V-meter & SWR/PWR indicator
This is a successor of the PIC16C71 4-digit LED f-counter & V-meter. Some hard to find parts used in the previous version, which are out of production for some time, has been omitted. A rather early PIC16C71 has also been replaced by 28-pin device PIC16F876. The later is capable of driving 4 digit LED display in multiplexed mode while measuring fr
Counter 0-9 Using Arduino Microcontroller
The high-tech credit card has been nicknamed "microcontroller super card" because of all the great improvement ideas. I showed how to first verify the code, and then upload on to the arduino board. I then wrote a code for the counter to go from 0 to 9 using a time delay of 1000ms (1s) after each digit. I ran through an error at some point...
geiger counter circuit
I bought one CI-22BG tube and one CI-3BG tube for total of 16G. Because I didn`t have anything radioactive to test my Geiger counter, I also ordered a piece of radioactive Fiesta dinnerware from ebay. Red Fiestware used to have uranium oxide in its glaze that was radioactive enough to be detected with a Geiger counter. Geiger tube needs a high...
simple frequency counter circuit
The circuit shown below can be used for measuring frequency or Hz. The IC is very simple to make andutilizesjust a single IC 4033 and a common cathode display as the mainingredients. If higher frequencies in the the order of two or threedigitsare required to be measured, then simple the number of modules can be connected in series as described
how to make simple frequency counter
A very simple frequency counter circuit is shown below and can be easily built by any electronic enthusisat for the intended purpose. The circuitdiagramwas provided by Mr. Kapital through an order in Fiverr. com, I was asked to explain the functioning by him. 3. These pulses are simply the generation of positive voltages in succession at a cer
how to build digital step km counter
This circuit measures the distance covered during a walk. Hardware is located in a small box slipped in pants` pocket and the display is conceived in the following manner: the leftmost display D2 (the most significant digit) shows 0 to 9 Km. and its dot is always on to separate Km. from hm. The rightmost display D1 (the least significant digit) sh
digital counter circuit
The Digital Counter Circuit is an electronic project that converts digital numbers (0-9) to binary (0-1). If you want to understand binary code, please click on "Binary Code PPT" to view a PowerPoint on Binary Code. Below is the Parts List, Schematic, and other information on how to build it. It will cost somewhere between $20 & $30 depending on t
diy geiger counter
implement free running counter in pic16f84a using seven segment display
This post provides the implementation of free running counter ( using c language ) for PIC16F84A micro-controller. This code is written in such a way that,..
pic16f877 up down counter code and proteus simulation
This PIC16F877 microcontroller tutorial answers the question, "" How to implement a up down counter using PIC16F877 ? "" Using PIC16 simulator (Proteus) you..
schematic diagram of my geiger counter
I found some relatively cheap ex-army radiation detectors at an army-dump shop. One of them appeared to be suitable to even detect the (usually low) background radiation levels: A Frieseke & Hoepfner FH40T Geiger counter (fitted with a FHZ76V energy-compensated geiger-mueller tube), sensitive to ³ (gamma) radiation and ² (beta) radiation over 0....
pic frequency counter using 16f877a
It uses the simpler method of direct frequency measurement which is easy to do but means that the number of digits displayed depends on the input frequency. If you want to display all digits all the time there is a technique called reciprocal counting- but this requires floating point (maybe fixed point) routines and would be difficult to...
timer and 4017 decade counter traffic lights circuit
Seven segment display circuit with the 4511 decoder and the 4029 counter
extended counter using cd4017
At the start condition all pin 15 are connected to the ground, so R0 is energized. A 555multivibrator sendsthe clock signalto IC1, which activates the outputs from R0 to R8. This simple circuit can be utilized to drive a monostable relay through a single button switch. At the start condition the relay does not work. When I press the button (P)...
up down counter circuit
This is the circuit diagram of a very simple up down counter that can be used of a large number of applications. The circuit is based on the IC CD40110BE which is a CMOS decade up/down counter. For ICs are used here. Common cathode seven segment display is connected to the 7-segment output of each IC. Display connected to the IC1 represents the low
Frequency Meter Circuits
VU Meter 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...
DIY HV Variable Capacitor
DIY PMA Alternator Plans
Digital Signal Integrity