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
555 Timer Circuits
RC Model Toy Circuits
H Bridge Circuits
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Improvements in the Design and Performance of PWLL
The p-Wave Locked Loop provides instantaneously the p to p time interval of the applied ECG and enables us to perform heart rate variability studies on the basis of p_p variation. The first version of the PWLL started its processing action with the determination of r-wave first and waited for the user to operate manually a switch to transfer its a
MC78L15ABPG Original supply
MC78L15ABPG positive voltage regulator, 100mA, TO-92
The CUSB-36R Christmas Light Circuit
This is the circuit diagram for the Comfile CUSB-36R Programmed Christmas Lights. If it is a little hard to read drop me an email at keithsw1@yahoo. com and I will return a more detailed schematic. Basically the Comfile CUSB-36R can either directly drive mains powered devices or it can drive relays to switch mains powered devices. There are two gro
This option has the advantage that one does not need to change anything in the receiver itself. However, since any filter will give some attenuation of the signal, this will degrade the noise figure of the receiver, and thus limit the weakest signal which could be detected. This is not a big disadvantage as it might seem, since at 20 MHz noise fro
Atlas Radio Diagrams
Design and implementation of a TC237 CCD camera.
Simple Circuit to Turn your Oscilloscope into a TDR
This simple circuit allows you to use your oscilloscope as a Time Domain Reflectometer (TDR). This is how it works. Send a pulse down a cable and watch for the.
Mods for JCM900-4100
Mods for JCM900-4100 Note: there are many versions of the schematic for this amp, proceed with caution!! VERIFY which version of the board you have by matching part numbers with the schematics posted.
Autopilot UAV Project
Autopilot for model helicopters, with 3 axis IMU/INS+GPS.
autotronics injector circuit
The above diagram shows the different links to theinputs and outputs of each operational-amplifier from the power source and how each operation amplifier is wired to operate each seperate light emitting diode. Also shows calculations to obtaining each resistor value which is shown in previous blog. The above equipment was used to to supply voltage
MP3 players are all the rage these days. The smaller ones in memory-stick format are particularly easy to take with you; your very own personal sound system` on the move! It`s when you want others to share your taste in music that you ¬nd these players to have a lack of power. You can get round this problem with the help of the MP3 booster, a sm
JTAG from a router
It`s a quick hack on veroboard rather than a neat PCB, but here`s the schematic. Three outputs (TMS, TCK, TDI) run to the 74HC04 for buffering. The /RESET output drives a pull-down NPN transistor directly. Note that the 74HC04 is driven from an external Vcc taken from the target circuit; this allows the output voltage to be controlled by the targe
The key point is that there is no iteration as is usually done. All alignment methods I have seen rely on measuring, tweaking, measuring, tweaking, etc. There are many problems with this: for the DIYer it means expensive tools or settling the suspension after each adjustment. My thought was to completely short circuit all of that and find a way to
basics of electricity
The study of electricity revolves around a few common terms that describe the behavior of electrical charge. Electrical charge and its associated phenomena are a fundamental part of the world that we live in. The understanding and use of electricity is largely responsible for the advanced technology that we enjoy today: electric light, heat, digit
Got a free treadmill. Here`s the diagram that came with it. Sorry about the size. I have a question about a board that is up in the console. It has four readouts, time, speed, distance and calories. Don`t need those. It also has a membrane panel with four buttons. Start/pause, and speed up/down. On the diagram it shows where the speed function...
Solid state winch control
I am interested in building a solid state control for my Warn 8274 self recovery winch. The current control scheme uses 4 constant duty 200 amp solenoids. 2 switched in parallel to connect the field 1 terminal on the motor to the armature for power in, and the other two in parallel to connect field 2 to the armature for power out. The solenoids...
Lawn Mower Starter
My JD mower, for quite awhile now, has been very erratic at starting. Sometimes the starter will activate, but more often it will not. Yet after a long wait it will sometimes start. I found a tip on the internet, recommending puting a relay in the circuit. The explanation being that the circuit doesn`t have enough oomph to drive the solenoid...
Look for the OSCCON register in the data sheet (as of this edit, page 19). This register, among other things, controls the speed of the internal clock. Upon startup, the processor runs at 31 kHz (way too slow. ) Using OSCCON, we can increase the speed to 8MHz. on reset all your pins are set to input (TRISB is set to high). So set TRISB low to do ou
Schematic Circuit Ic Stk
Amplifier circuit with IC STK is tough and good quality. In this article an amplifier circuit with IC STK another base. Power "Amplifier 200Watt By STK4050. Auto Wiring Diagram Advanced Symbols. Wiring Diagrams Color Coding For The Speaker Wiring On A 1986 2005. Circuits 2004 2007. Wiring Diagrams If You Plan. Because this amplifier circuit oper
AC power is rectified and applied to the motor in the same polarity when the momentary switch is held in one direction and reversed polarity when the motor is held in the reverse direction. The remote car starter package that I used includes a control unit, an extended range receiver, a status LED, a valet switch, and four wiring harnesses. In thi
Coffee bits and bikes: Mini85
The first version of the schematics is finished. There are still some optimizations to do, specially regarding the logic gates. The resistors in the directly connected to the 8085 are not really necessary but handy if a later expansion is needed. It is still difficult to print schematics with gschem, I tried the light output but it is not the best
Custom Silicon Solutions
I read Doug Grant`s article regarding Heathkit in his Blog via the EDN Network. Doug reminisced about building his first Heathkit and how much he learned. He suggested that every EE had at least one kit and I suspect he is right. However, as Doug pointed out, Heathkit eventually faded away. I built a number of kits, including an oscilloscope, a so
Mole Deterrent Teardown
Having a very healthy population of moles in our vicinity, I logged onto eBay and bought four of the cheaply available (ultra )sonic mole deterrents for our garden lawns in the hope of persuading them to move elsewhere. Here`s a link to a couple of similar ads: eBay ad, eBay ad2. The basic idea is pretty simple and used with other animals too
BBC Micro Model B and a plume of acrid smoke
So, after yesterday`s post about The Demon Machine I decided it would be fun to play around with the BBC Micro Model B and so I plugged it in and powered up. The familiar two-tone boot sound played and the machine was on. About 15 minutes after power up there was a fizzing, popping sound from the computer and I ran to cut the power. Too late! A pl
In order to avoid any soldering mistakes, I asked students to place all there resistors in the board first, and once I checked them, they could solder away. Capacitors were next, then LEDs then everything else. The middle school class had more success with putting the kits together quickly. Maybe soldering was more of a novelty for them They comp
UKDM Honda DC2 rear fog lamp to an RSX
This guide will show you how to install an EDM/UKDM Honda Integra DC2 rear fog light on your 05-06 Acura RSX.
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