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
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
How to add 32K crystal/clock source to AVR Microcontroller (ATmega8)
This article explains how to add 32K external crystal/clock source to Atmel AVR micro controller Atmega8 with circuit diagram & C program..
CDCF5801 Low Jitter PLL Based Multiplier/Divider With Programmable Delay Lines Down To Sub 10ps
The CF5019 series are high-frequency, 3rd overtone crystal Oscillator module ICs. They incorporate an oscilla- tor circuit and an output Buffer that operate at high frequency on a single chip. The Oscillator circuit employs CMOS inverters and a built-in damping resistor RD, reducing the crystal current compared with existing devices. The damping r
PLL1706DBQ 3.3-V DUAL PLL MULTICLOCK GENERATOR
This application report presents one possible solution to the telecom plug-in power problem, based on a nominal 48 Vdc system bus and a module needing two low-voltage supply outputs. The material includes a detailed design methodology for tailoring the circuit to the specific requirements of the reader`s system. The solution is based on two dev
SEL2411AA Crystal Clock Oscillator 3.3 & 5V High Frequency ECL
SI2171 is a sub package of SI2170, If you need see the description, please click SI2170. If you need SI2171`s datasheet, please download it from below. By Silicon Laboratories
Commodore 64 Clock Circuits
Crystal Y1 develops a 14. 31818MHz fundamental frequency clock signal. U31 is a Dual Voltage Controlled Oscillator. The output on pin 10 is a 14. 31818 MHz clock signal called the color clock. R27 can be adjusted to obtain exact output frequency. U30 is a frequency divider that outputs a 2MHz signal on pin 6. U29 is a D flip flop which outputs a...
Hacking an alarm clock
We will bypass the mechanical snooze switch on top, and instead turn the alarm clock off in a much more fun way: punching it! Hopefully along the way I will be able to teach you some techniques that are useful in reverse engineering, so you can apply them to future projects. This project is aimed at intermediate electronics enthusiasts, who have...
28 LED Clock Timers
This is a programmable clock timer circuit that uses individual LEDs to indicate hours and minutes. 12 LEDs can be arranged in a circle to represent the 12 hours of a clock face and an additional 12 LEDs can be arranged in an outer circle to indicate 5 minute intervals within the hour. 4 additional LEDs are used to indicate 1 to 4 minutes of time
24 Second Shot Clocks
To start in 24 seconds; 24s LOAD SW and Reset SW should be push simultaneously. If not, the count will start in 99. Pulse input can be connected to 555 astable multivibrator but must be calibrated for real time clock. The PAUSE SW must have a Switch Debouncer so that the counter will count normal when counting is paused and then turn-on. When the
GPS-Disciplined 10 MHz Frequency Standard / GPS-Based Universal Time Clock
As shown in the block diagram above, the 10 MHz signal is produced by an oven-stabilized 10 MHz crystal oscillator that is locked by a phase-locked-loop circuit (PLL) against the precision 10 kHz signal generated by the GPS receiver module. In addition to the 10 MHz signal, precision 10 kHz and 1 Hz signals are also output by the system. The 1...
Single Digit E1T Clock
To me the E1T counting tube is unmistakably one of the most intriguing tubes ever made. It was invented and developed into a product by Philips in the period 1946-1954. On one of my other pages I have posted an in-depth study of it`s origins. It has long been my whish to build a clock with this wonderful device. One of the problems of making a...
A Meter Clock for Eugene
Tube in a Tube Clock
The clock described on this page is the result of both events, a simple single digit nixie clock with some interesting features, but without any difficult components. This clock first of all demonstrates that it is possible to use standard, low-voltage, general puspose, small-signal transistors like the BC550, as nixie drivers. Since I can...
Decatron Clock Project
Instead of simply incrementing the time every new second, it would be great to have a display of forward- and backward-spinning digits, slowly rolling-out to the new time, a little bit like the reels of a slot machine. Having never encountered them, decatrons are completely new to me. How do they work, how to interface them to a processor...
Happened to have in my NIXIE collection a single beautiful giant ZM1042 (for the record, I got it from Jim Oostveen). For me it was obvious that a single digit NIXIE clock built around this tube would be just the thing for Geert. Some time ago, while visiting our local IKEA store, I found just the perfect case for the clock: a 14x19x8 cm wooden...
A Mixed-Signal LED Clock
The term "mixed-signal" is usually reserved for circuits and ICs that process both analog and digital signals. In that sense the title "A mixed-signal LED clock" is perhaps misleading since this is a digital clock from beginning to end. However, the readout is analog and since the beast had to be given a name, I a called it my "mixed-signal" clock
NIXIE I NIXIE clock using six ZM1030 tubes
We mounted one of them on a wooden sigar box and connected the anode via a large series resistance to the live wire of the 220V mains! Just by touching one of the cathodes it was possible to make the numbers glow.I think that this was the beginning of my life long fascination for these misteriously glowing tubes. They are in one word beautifull!...
Talking Nixie Alarm Clock
The B8422 Nixie tubes were destined to end up in an alarm clock on my bedside cupboard. My house is slowly filling up with homemade clocks, only our bedroom has so far been saved from the "collateral damage" of my clock making mania. A set of romantically glowing nixie tubes will make a big improvement compared to the ordinary twenty year old
Numitron Clock with Battery Back-up
The idea was that you removed the center page from the magazine and cut it into four pieces to obtain a card that would fit into a filing system. The front side of each card would gave the connections to the IC, while the other side would contain technical details and an application circuit.
Analog 5Gb/s Clock-and-Data Recovery Circuit
A clock-and-data recovery (CDR) circuit is used to both recover the clock from a transmitted data stream and re-time that data with the recovered clock. Such circuits are typically placed at the front-end of receiver chips to recover the clock from data sent from a transmitter chip across a backplane or other channel. This project presents a fully
clock and Timing ICs
If sine wave is very essential it can be derived from the square wave. One of the most popular IC used to generate clock from Maxim Integrated Products is MAX9471. Please refer this circuit below to design a clock generator out of this device. This device can be used generate clock frequency in the range of 4MHz to 200MHz.
Building A Synchronous Clock
The quartz clocks which have dominated time-keeping for the past 20 years or so have one problem: their errors, although slight, are cumulative. After run..
Experimental Pendulum Clock
Using this design, you can construct an electromagnetically impulsed pendulum clock with a 1-second beat. On the prototype, the pendulum rod is 115cm long with a bob adjusted to make it beat every second. It is suspended on a short piece of mainspring from a watch, which is attached to a vertical backboard with a 6mm screw. The rod extends some 15
One second Audible Clock Circuit Schematic
This accurate one-pulse-per-second clock is made with a few common parts and driven from a 50 or 60 Hertz mains supply but with no direct connection to it. A beep or metronome-like click and/or a visible flash, will beat the one-second time and can be useful in many applications in which some sort of time-delay counting in seconds is desirable. Th
Pendulum Controlled Clock
Here s how to build a pendulum-controlled clock which can be made really accurate. Retro? yes, but an interesting project all the same. You ll need a sp..
Thrifty 2Hz Clock
CMOS circuits are known for their low current consumption. This is particularly important for battery-powered circuits. Unfortunately, oscillators often r..
1HZ Standard digital clock
This is a standard digital clock circuit,frequency size 1 Hz or 2 Hz. It can be used in the normal clock circuit. It consists of IC-4060 and IC-4013, the..
Cheap Digital time clock with alarm circuit by LM8560
The digital time clock is circuit that electronic amateurs are most interested. And The clock ICs that most popular are LM8361, MM5387, Unfortunately these ICs..
IC 4049 Square wave oscillator generator
We can bring the inverter CMOS digital IC is CD4049 Hex Inverting Buffer IC, to design the Square wave oscillator generator..
digital clock hour minute second circuit
DC Motor Clockwise Anticlockwise Control H-bridge Circuit
This circuit can control direction of a DC motor. This can operate the motor in both directions (Bi-direction) Clockwise and Anticlockwise (forward and back)
Digital Clock Circuit
I`m having issues simulating this circuit on Proteus. Please take a quick look and make sure I did`nt make a goofy mistake. I`m also a novice with..
Single Meter Clocks
An alternating display for my version 1 nixie clock led me to think of new logic designs for switching signals to the display. I took the design of my version 1 nixie clock, tossed out the 4013 flip flop and two 4017 counters, and redesigned the hours section and the reset circuits. A 4081 (quad 2-input AND gate) was used instead; a single gate...
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