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
USB Interface Circuits
USB Interface Circuits
V-USB is a software-only implementation of a low-speed USB device for Atmel`s AVR ® microcontrollers, making it possible to build USB hardware with almost any AVR ® microcontroller, not requiring any additional chip. Supports multiple endpoints: one control endpoint, two interrupt/bulk-in endpoints and up to 7 interrupt/bulk-out endpoints.
USB Ultra IR-Receiver v2.0 to PC remote control and power ON - OFF
This Atmel IC, is clocked in the circuit with a 12 MHz quartz and provides a communication between the Infrared receiver and the PC, so that this signal can being processed by infrared receiver programs like Girder. As soon as a valid RC5 signal of the remote control arrives, a green low current LED with a 1. 5K resistance and the opto coupler with
usb ultra ir receiver circuit
USB Laptop Fm Modulator
A usb powerer laptop Fm transmitter using for home theater and other woofer that have fm reciever to transmits songs of laptop to sound system of ur room.
interfacing usb 2 with arm7 friendly
PCM2706 USB DAC with I2S
A couple of USB DACs but no one have I2S output. Some people doesn`t need S/PDIF input and they want only USB. With these requirements is unnecessary to convert signal first from USB to S/PDIF and next to I2S for DAC. This board have analog headphone output, electric galvanically isolated S/PDIF output and optical TOSLINK. After switching jumper...
USB audio DAC with PCM2704
High quality DAC convertor from USB to S/PDIF. I choose PCM2704 circuit, which sent me TI company like sample. Circuit has analog output for headphones and digital S/PDIF output with electrical and optical(TOSLINK) interface. We can use too 3 HID buttons for setting volume and mute. Schematics is almost identical to PCM2704 datasheet. Circuit...
USB to RS232 converter
The FT8U232AM requires a small number of external components to produce a device that converts USB to TTL level RS232 signals. All you need to add is a TTL to RS232 converter to provide the 12V RS232 logic levels. The FT8U232AM and supporting components is also available as a complete module - called a USBMOD1 - in a 32pin DIL IC package, making t
The bootloader can be used for the all USB PIC devices (PIC18F4550, PIC18F4455, PIC18F2550, PIC18F2455, PIC18F4553, PIC18F4458, PIC18F2553, PIC18F2458). Since the bootloader is designed for the Microchip demo board, the configurationof the bootloader possibly will not fit for your project. E. g. you want to use another pin for bootloader mode...
Solving the USB Only Chicken or Egg Problem
Many excellent ISP (In System Programming) designs exist for 8 bit AVR microcontrollers. However, most require a pre-programmed microcontroller, or the "Chicken or Egg" problem: you can`t program microcontrollers unless you have one already programmed. Parallel Port or Serial Port solutions have existed, but many modern computers no longer have...
Simple PIC USB Interface Circuit
Hardware design for USB is actually quite minimal, which is a big plus for us. However, what you quickly find out with USB is that the easy hardware design means the communication and control software is very complex, we`ll see more about that in the theory and software sections. The main devices used in the circuit are the PIC 18F4455, USB...
USB / CAT (CI-V) adapter
Is based on the FTDI`s USB / serial IC FT-232BM. The adapter has been successfully tested with the following transceivers and software: VX-7R (VX-7R Commander), FT-8900 (FTB-8900), FT-817 (FT-817 Commander and Ham Radio Deluxe) and IC-706MkIIG (Ham Radio Deluxe). The USB / CAT (CI-V) adapter is based on the FTDI`s USB / serial IC FT-232BM. It...
USB Interface Board Tutorial Using PIC18F4550
This project demonstrates a computer control interface using a USB Board. (USB INTERFACE PROJECT). This tutorial will show you a simple way to control some device like led, motors and other devices with computer through a USB Board. The traditional way to control devices from a computer was to use a parallel printer port which is much more easy to
Sega Saturn controller to USB adapter
This projects makes it possible to use Sega Saturn peripherals (controllers, mouse) on a PC through an USB port. Using the schematic and firmware available on this page, one can make an adapter (Using the connector from a Saturn extension) or convert a controller (if it has enough internal free space). Thanks to USB HID compliance, the adapter wor
USB Dual 2.5W multimedia power amplifier circuit diagram
Usb mouse circuit diagram
MAX1811 USB mobile phone emergency charger circuit diagram
BH1417 USB FM Transmitter
Here`s BH1417 USB FM Transmitter with built-in PLL circuit. Its low-frequency signal is converted into high-frequency, which can take any audio device with FM radio (stereo, car CD, MP3, DVD player, etc.), as a normal radio station. Transmitter power is sufficient for reliable reception of its signal within a few tens of meters. The basis of the...
USB Mono FM Transmitter
This small FM transmitter with a range of about 50 meters designed for connection to the USB port. With lots of mini-transmitters then you have a comprehensive, action-packed radio program. Due to the power supply via the USB port of a high frequency stability is achieved. Alternatively, the receiver, a battery 5 to 12 volts to operate. FM...
USB AVR ISP In-System-Programmer
Step-Down Charge Pump Regulator for USB Powered Devices
this is a circuit of Step-Down Charge Pump Regulator for USB Powered Devices. The critical design parameter of this circuit is the circuit area. To solve this..
Automatic Switching for Battery USB Power Connection
This is a simple circuit for automatic switchover between battery and USB port. This circuit uses more general step-up converter architecture. Compared with an..
It makes sense to build your own individual joystick. Especially the flight simulation enthusiasts like to build cockpit parts with the look and feel of original aircraft parts. Such self made hardware needs an joystick controller that meets the requirements of the hobbyists. This project is ideal to build up devices with up to 5 axi
model RC as USB Joystick
Model aircraft pilots like to use PC-flight-simulator software to train the handling of model aircraft without the risk of the loss of real models. It makes sense to use the own model aircraft remote control (RC) as input devise for the software. This requires an adapter. This adapter has to convert the RC into a virtual USB-joystick. This...
Build a USB Powered AA NiMH and NiCd Battery Charger
This project, which can charge a pair of AA Nickel Metal Hydride (NiMH) or Nickel Cadmium (NiCd) cells using a laptop`s USB port for power, arose to address part of that problem. (By the way, if you want to lighten your laptop load, take a look at the MoGo Mouse. ) Any USB port can supply 5V at up to 500mA. The USB standard specifies that a...
Multi-functional 100W Power Inverter with 5V USB
A durable car power inverter can give you a more convenient life. 100W car power inverter is the best choice for traveler when driving outside, or meeting an urgent need when power failure. AC adapter can be widely fit to all kinds of electrical devices which voltage rating are AC 220V. You can operate your home or office electrical devices with t
USB Live Oscilloscope: ADCV Board
The analog input is first fed into a fast non-inverting buffer amplifier (OPA353) set up for unity gain which protects the analog-to-digital converter from out-of-range voltages. The ADS830 is a fairly cheap 8-bit analog-to-digital converter which supports sampling clocks from 10kS/s to 60MS/s. It has sort of a 3-stage pipeline meaning that the co
USB Live Oscilloscope: Clock Generator
Produce the varying sampling clock write strobe pulses. So, I settled with this semi-optimal but working design applying an ATtiny2313 microcontroller from Atmel. For a 10MHz sampling clock, I need a 20MHz clock for the ATtiny2313and hence it needs to be powered at 5V instead of 3. 3V like all the other logic around. So, I had to add these HCT04...
USB Live Oscilloscope: Digital Input Board
The digital input board has 8 distinct digital inputs available on JP1. There are separate pull-down resistors (RN1, choose a value you like, e. g. 1MOhm) and then each input has a Schmitt-trigger. Since these may be destroyed by improper input voltages, I chose to use HC14 devices in DIL-14 packages and mount them on sockets to be easily replaceab
USB Live Oscilloscope: Main Board
The two input boards ( ADCV or digital ) get connected to AD_CTL1, AD_DATA1, AD_SUP5V_1, AD_SUP3V3_1 for the first board and the same names with suffix 2 for the second board. To transfer the sampling data, the 16 digital data lines from the two input boards are fed into the 16bit wide bus of the FX2-USB board (USB_PA, ). Each input board can have
USB 8bit Interface Board
The goal was to make a small USB interface board which could easily be connected to microcontroller boards. It should support USB-powered as well as externally-powered operation. External components are kept at a minimum (but there are still quite a lot of them). The board may be used as USB-powered device (externally connect pins 1 and 2 on the S
Avr Usb 500 v2 open source Atmel AVR Programmer stk500 V2 compatible USB interface
Computer Interface 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