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
7 segment led displays package dimensions and logic diagram
open 7400 logic competition entry wheely bin night reminder
make mini logic analyzer
This mini Logic analyzer is a tool for you to watch on LCD the logic transitions 0 or 1 of a digital data signal. A digital data signal can be found on the output pin of TSOP-1730 Infrared Receiver, on the Transmit and receive pins of MAX-232 chip (RS-232), on Clock and Data pins of I2C data bus and many more electronic components. This circuit su
24hr clock using logic ics
The count advances as the clock input becomes high (on the rising-edge). Each output Q0-Q9 goes high in turn as counting advances. For some functions (such as flash sequences) outputs may be combined using diodes. The reset input should be low (0V) for normal operation (counting 0-9). When high it resets the count to zero (Q0 high). This can be do
audible logic probe
When testing circuits with a logic probe, it is sometimes difficult to watch the LEDS on the probe to determine the logic state. With this probe the logic states are audible. This probe is designed for TTL circuits only but could be modified for CMOS. The way it works is as follows. The 5 volt power source will be the circuit under test. Clip the
leveraging fpga and cpld digital logic to implement analog to digital converters
electrical engineering logic gates
Design a circuit with four single-bit inputs X, Y, T, and Z, but only one single-bit output E. A two bit control code word S0S1 selects which of the four inputs is propagated to the output (the selection code is not unique). Your answer should be in the form of a circuit diagram and table showing which selection code selects which input. You may...
ttl three state logic probe circuit
The circuit presented here usesNAND logic gates of Hitachi HD seriesIC HD74LS00, which is a quad NANDIC. Special technique has been employedto obtain three-state operation usingjust a single IC. Gate N1 is wired such that when theoutput of gate N1 is at logic 0` (i. e. whenits input is at logic 1`), LED1 will glow, to indicate high state of the...
basics ladder logic
Ladder logic programming method is a method commonly used in electrical simulation schematic control system programming languages evolved. A circuit control system but the basic purpose of the decision in some cases all the load circuit should be opened or closed. So as to understand the ladder line, the flow of the circuit should be remembered...
logic circuit diagram
The two drawings using the LM324 op amp to form a lower voltage comparator, resistor R1, R1 component partial pressure circuit, the op amp A1 is set at a level U1; resistor R2, R2 voltage divider formed for the op amp Comparison of A2 to set the level U2. Also added to the input voltage U1 A1`s positive input and negative input of A2 between, when
low pressure logic wellhead control
Filter Regulators, solenoid valves, Quick Exhaust Valves, Flowline Pilots - Welcome to Bifold Fluidpower Ltd..
make simple logic circuit design projects
logic circuit diagram
Commodore 64 Reset Logic
U20 is a 556 timer configured as a one shot multivibrator. The output pulse width is determined by the size of R34 and C24. Pulse width = 1. 1 x R34 x C24 =. 5 seconds. The output on pin 9 is "high" active. The output of U8 is "low" active. Reset initializes all the processor logic and causes the processor to load the program counter register...
Original Macintosh 512K Logic Board Schematic
The following is one of the most rare and special documents here at the DigiBarn, the only known copy of the complete schematic specification of the 512K Macintosh Logic Board. Daniel Kottke co-authored this design which served as the basis for the 64K Macintosh prototypes and then the 128K launch Macintosh in January 1984. This may be the last ma
This circuit is a Logic Probe. It indicates the logic state of the node of any TTL logic circuit. To do that, we have to supply the probe with the same power of the circuit that we want to analyse: same Vcc and same GND. To check the logic level, we must connect the "Test" wire of the probe to the desired node of the circuit that we want to check.
Logic PSU With Over-Voltage Protection
A simple 5 Volt regulated PSU featuring overvoltage protection. The 5 volt regulated power supply for TTL and 74LS series integrated circuits, has to be v..
Simple Logic Probe
This simple logic probe has both LEDs on with no signal at the input but due to the nor gates connected to the probe, indicates correctly when a high or low signal is present. It also works correctly for pulse trains. Normally both LEDs are forward biased and therefore on, powered by the 12V supply. When a logic high is present at the probe, IC
Many Logic probe circuit ideas
Logic probe is useful tool to measure, in a check digital circuits. As a meter, which is used to measure power in electrical circuits. Logic probe was used for..
Liquid detector circuit diagram using logic gates
The liquid detector is a detector with liquid alternating voltage and can be built using some common electronic components. Voltage alternative for this circuit is made using a gate with Schmit trigger function, which works as an alternative power oscillator. If between both electrodes is electrically conductive fluid as a result of recovery actio
Combinational Logic Circuits using Logic Gates
Electronics Tutorial about Combinational Logic Circuits that use Logic Gates to make Multiplexers, Encoders and Solid State Switches..
Logic NOT Gate Tutorial with Logic Gate Truth Table
Digital Electronics Tutorial about the Logic NOT Gate also called an Inverter and the Logic NOT Gate Truth Table used in TTL and CMOS Logic Gate circuits..
Logic State Indicator
Here is a simple logic state indicator to test whether the output of digital IC is in logic 1 or 0. The Bicolor LED lights Green when the logic state is 1..
Logic Probe Tester Circuit
Logic testers are simple but very helpful devices in testing digital circuits. A logic probe can be designed in many different ways. In this particular des..
CMOS Logic Circuits
Controlling a relay with a digital logic level circuit
The schematic below illustrates 4 methods of controlling a relay with a digital logic signal. Figure (A) can probably be used in most cases where the relay coil requires 100 mA or less and the input current is 2 milliamps or more. The resistor value (R) is determined from the input voltage and the available current. For example, a 5 volt input sig
Pulse Reading Logic Probe
This logic probe uses a single CMOS IC and shows three logic conditions, High, Low and Pulsing. In addition if the probe input is neither hi or low (the high impedance state of tri-output logic ic`s) then no LED`s will light. Power from the logic probe is taken from the logic circuit under test; using a CMOS IC enables logic circuits to be tested
Simple RIAA Preamplifier using Logic IC CD4069
Logic Probe Circuit Schematic Diagram
The following instructions will allow you to build a practical test tool for troubleshooting and analyzing digital and microcontroller circuits. The complete Assembly and Instruction Manual can be downloaded from the the following web link: Don`s Projects Snap a 9V Battery to the battery clip. The Letter L should be displayed on the 7 Segment LED
Logic Probe With Sound
This logic probe can be selected to operate on TTL or CMOS logic levels, depending on switch S1. A string of resistors associated with switch S1 sets the threshold levels for a window comparator comprising IC1a and IC1b. Depending on whether the level applied to the probe is high or low, the window comparator turns on LED1 (high) or LED2 (low). Th
Electromechanical relay logic
In ladder logic symbolism, an electromechanical relay coil is shown as a circle, and the contact(s) actuated by the coil as two parallel lines, almost like a capacitor symbol. Given this knowledge, interpret the following ladder logic diagram: How do we know which relay contact is actuated by which relay coil How does this convention differ...
CMOS Logic Experiments
Digital to Analog Circuits
Analog to Digital Circuits
Data Logging Circuits
Data Bus 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