It is a CY8C27443-based Solar Pump Controller that operates a submersible water pump directly from solar panels. It is ideal for remote areas that lack conventional power supplies. The powerful PSoC provides three-phase PWM generation, signal conditioning, temperature monitoring, constant voltage-to-frequency control, and over-current and fault protection.
Published: May 6th, 2008
Traditional bridge circuit solutions measure capacitance by including the measured capacitor in a bridge where the balancing elements are known and accurate. Because alternating current is used, this approach is inapplicable to certain capacitor types (e.g., tantalum and aluminum electrolyte) in which a thin layer of metal oxide serves as the dielectric. These oxides exhibit certain semiconductor properties that naturally affect the accuracy when AC is flowing.
Published: May 6th, 2008
It is a solar-powered data collector that records sunlight exposure. This RCM3400-based device is the perfect tool to have on hand when scouting out sites for solar panel installation.
Published: May 6th, 2008
When designing high-speed applications, working with SMT components and soldering by hand can be tedious. Robert H8-3687-based SMT Reflow Oven Controller transforms a conventional infrared toaster oven into an effective reflow oven that ensures thermal control.
Published: May 6th, 2008
Starting with the digital section. IC1 is the clock generator, which runs at four times the sampling frequency. The frequency is adjustable over a limited range by VR1, the Delay Fine control. This slightly unusual configuration gives an output with an approximately equal mark-space ratio.
Published: May 6th, 2008
The dynamic range of an audio signal is the difference between the quietest discernible part of the signal and the loudest undistorted part of the signal. It is normally expressed in decibels (dB).
Published: May 5th, 2008
The requirement for a talk switch at each end on a two-wire system complicated the design slightly. Capacitor C17 is connected in series with the remote speaker, and is short-circuited when the talk switch is pressed (R22 limits the discharge current). The electronics at the local end detects the DC path when the switch is pressed.
Published: May 5th, 2008
The amplifier is set up for a voltage gain of about 20, with a high pass filter to reduce the gain near DC. Because of this, DC offsets are not amplified so no audio coupling capacitors are used, which helps to keep the sound quality optimum and save large, costly non-polar caps on the speaker outputs.
Published: May 5th, 2008
The Car shows the distance a train travels on a 5 digit LCD display. The distance is indicated down to 1 of 100th of a mile (about the length of a 50 foot car) with an accuracy of approximately plus 2 percent using a standard 33 inch freight car wheel.
Published: May 5th, 2008
This PIC16F84a based repeater DTMF controller is very simple and economical to build. It also gives you hand-on experience of using and programming PIC Micro controllers. Controller measures 10cm X 6 CM and may be housed in your repeater project enclosure.
Published: May 5th, 2008
The Programmable Unijunction Transistor used to trigger the SCR is the key to this design as it ensures that the SCR fires on every cycle of the fullwave DC. This gives a very efficient operation with low voltage loss and very little heat generated.
Published: May 3rd, 2008
The design goal was to build a fairly simple device which allows to digitize signals with frequencies ranging from DC to around 1MHz with very long sampling buffer (i.e. millions of points).
Published: May 3rd, 2008
Digital noise is a series of (more or less) random low/high pulses. Analog noise is an analog signal without any (apparent) order. There exist several types of noise, the most important ones being "white" noise, "pink" noise and "brown" noise.
Published: May 3rd, 2008
This alarm system was originally designed to protect the contents of a garden shed, although it would also be ideal for other outside buildings. In addition it would offer a good basic security system for small residential areas, such as flats and bedsits. It may be installed without drilling or attaching to the building, which could be an advantage in rented accommodation.
Published: April 30th, 2008
Here is a little audio amplifier similar to what you might find in a small transistor radio. The input stage is biased so that the supply voltage is divided equally across the two complimentary output transistors which are slightly biased in conduction by the diodes between the bases.
Published: April 30th, 2008
The amplifier is capable of driving 4 Ohms, but it is starting to push the limits of the transistors, however, even when used at 4 Ohms, very few failures were encountered.
Published: April 30th, 2008
Here is a simple timed DC throttle that has controls for the length of run, accelerate/ decelerate and the maximum train speed. The circuit also has automatic current limiting.
Published: April 30th, 2008
This project is a second revision of the MiniPOV. This version changes from the PIC 16F630 chip to the Atmel ATtiny2313, which is a little more expensive but has many improved features.
Published: April 25th, 2008
The circuit shown on this page is a reasonably Low Cost and moderately Hi-Tech ammeter for use with DCC systems. The circuit meter output is always has the same polarity regardless of the input polarity. This allows a low cost DC voltmeter to be used to monitor a DCC current.
Published: April 25th, 2008
This page presents various capacitor discharge power supply circuits for use with twin coil switch machine motors. Also shown are some optional wiring methods that can be used to enhance the availability and control of these supplies.
Published: April 25th, 2008