Top Circuits Page 245
- Page 245
-
The PCB we have made is big and has plenty of space for cutting and adding other bits and pieces. But if we want the final satisfaction of seeing it working, mounting the lot on a real bike, it is a bit too big. Way back in chapter one, we discussed sensors....
-
-
Using it to (hopefully) drive a 6-wire linear actuator, which will slowly push a syringe pump. The motor is a Hurst SLS custom-jobbie I got from a surplus dealer here in Silicon Valley; the label says 12VDC, 11 1/2W (which, in my newbie brain, means about.....
-
-
-
-
-
-
-
For all of the following tests, we used a high quality signal generator from BlackStar. The PicoScope trace below shows a pure 1 kHz tone from the signal generator. Please note: although the screenshots below show the THD, SFDR and SINAD measurements in a....
-
An electrocardiogram or ECG (also known as EKG ” abbreviated from the German word Elektro-Kardiographie), is an electrical recording of the heart and is used in the investigation of heart disease. This application makes use of a DrDAQ Data Logger to read and....
-
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....
-
A few old N64 controllers lying around and figured that it would be pretty cool to use them to control other things. In this article I will describe in detail every step I took to achieve this. I`ve used a PIC microcontroller, but it should not be too hard....
-
-
What do you do with those old 2-Meter FM rigs that don`t have any CTCSS tone capability Well, you add it of course! While big knob` tone encoders have been available from several sources, their downside has been having to know the tone of the repeater you....
-
Currently have a decent interrupt-driven RS/232 driver with support for hardware flow control running at 9600 bps. Higher baud rates are possible but I have not yet tested for stability. I also implemented some helper routines to print and get strings,....
-
The game as originally envisaged placed the three balls as they were locked in holes on a slowly rotating ring around the Deadworld. When the third ball was locked, they were released by a mechanical arm and dropped onto the playfield. This was how it worked....
-
Had noticed balls getting stuck in the ball trough, not loading into an upkicker or not sitting directly on trough ball microswitches/optos, causing the machine to think a ball was missing. My first thoughts were that the ball trough itself had become....
-
-
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.....
-
-
This would be a lot easier with a display kit purchased from PJRC, which comes with the correct firmware installed on the display, a working pushbutton board, and the two cables needed. The PJRC display comes with a 4-pin plug that mates with the MP3 player,....
-
This new design has replaced the old one. The design shown on this page is obsolete. The new design has more features, is flash upgradable, is much easier to use, costs less, and is actually available if you`d like to buy one! It`s better than this old....
-
The two unspecified polarized capacitors (one directly above the transformer and one directly to the right of the transformer) are actually each a pair of 470 µF capacitors in parallel (for a total of four 470 µF capacitors). These capacitors MUST be Low-ESR....
-
This page`s mission is to help you understand how to use the STA013 MP3 decoder chip in order to design your own MP3 player. The player design described at the rest of these pages uses the STA013, but this page is intended to help you understand the STA013....
-
This is a "beta release" schematic. Use at your own risk The idea is to add this circuitry to a board with already has ram at 2000 and an 82C55 I/O chip to provide ports A, B and C. Warning: not shown here is a memory mapping trick which is described below.....
-
A newer version of this circuit board is available. Rev 4 includes a faster CPU, more memory, more I/O and an optional LCD. We recommend you use Rev 4 for new projects. Even though this older board is no longer available, we are keeping these old pages....
-
There are some important considerations to using more memory, but it certainly is possible. the mp3 player project uses 32 megabytes! But using more memory requires careful consideration. The most important factor is that the 8051 processor has a 16 bit....
-
-
Measure voltage across the 1k resistor connected to the input stage and Vcc. The DC voltage should be about 2 volt, or 2 mA of current through this resistor. Eg, if Vcc is at 24 volts, the side of this resistor connected to the 2N5210 transisor ought to be....
-
-
-
The 82C55 and 7 segment decoders on the display board will be changed to a group of shift registers on the display board, so that the 82C55 and the large number of wires won`t be needed. The ADC0804 will be replaced with a serial interface ADC chip, and the....
-
-
-
-
-
-
-
Virtually all AM radio manufacturers used this exact circuit from about 1948 to 1963 or so. People are starting to collect these radios as antiques of sorts. I would be happy to credit the creator of this figure and caption, but I don`t recall from where I....
-
A single-ended tube headphone amp using the TTVJ Millett 307A. I`ve been breadboarding various SE and PP power amp circuits with the 307A for a good year or more, but just haven`t had the time until now to come up with anything I like. As far as I can tell,....
-
This is a single-ended triode amp that I built using the 813 transmitting pentode, connected as a triode. It`s a fairly powerful SE amp that works very well. It uses a single pentode as the driver (a 12HG7 video amp tube), and a solid-state power supply with....
-
This odd little amp was something I designed and built for a shootout at the European Triode Festival in 2007. The topic was "White Light" - amplifiers that use thoriated tungsten tubes. Some great photos of the event can be found here and here. Since it`s....
-
Is it possible to make an op-amp out of nothing but 555 chips and passive components? Not a terribly practical question, given the existence of very inexpensive and capable op-amps covering every corner of op-amp performance space; but it has some aesthetic....
-
-
The A1301 and A1302 are continuous-time, ratiometric, linear Hall-effect sensor ICs. They are optimized to accurately provide a voltage output that is proportional to an applied magnetic field. These devices have a quiescent output voltage that is 50% of the....
-
Because the recent events in Fukushima, Japan, brought a lot of concern on radiation levels, by popular demand, here is a simple Geiger Muller counter using the Russian tube SI-22G and a single transistor regulated inverter that puts out 400V, as required.....
-
A nice and compact setup, that works off-line, directly at 220V, with only a voltage doubler to get the plate voltage up to 560V DC. I don`t need to go into details explaining this circuit, it is a simple Armstrong oscillator, using the feedback coil L4.....
-
-
An electric fence, perimeter protection circuit, designed to run on batteries, and provide configurable pulses of up to 20KV, to protect a tent perimeter against bears or other animals, out in the wild. The device uses two 555 timer circuits to generated a....
-
-
The coil has been added a few extra turns, so I had to find a way to improve the insulation. I opted for epoxy, with some extra quantity added over the soldering:..
-
An efficient, stable, easy to build construction for all your radiation dosimetry needs. I started from scratch, designing a complete dosimeter unit around the Atmel Atmega8 microcontroller and a Russian Geiger Muller tube. Here you`ll see the CTC-1 tube,....
-
An ultrasonic beacon and a ultrasonic receiver is very similar to a beam barrier circuit, the only difference is we don`t sound an alarm when an object breaks the ultrasonic path, but instead we try to locate the ultrasonic beacon by moving the receiver.....
-
Using an Atmega8-8PU (configured for 8MHz with external crystal), a Nokia 5110 lcd, and a transistor to handle the pulses from a reed relay. A 3. 3V regulator provides the voltage for the entire circuit. Everything has been mounted on a test board, including....
-
This circuit uses an LM2917 frequency to voltage converter. The input was connected to the low voltage side of the ignition coil, and the various components around it design to produce a full scale output at 6000rpm, which corresponds to 12000 ignition....
-
Back panel terminal connectors: Audio out, Trigger In, Clock In, Clock out CV out; plus the chord of the power supply which is internal, note that there`s no button to switch it ON/OFF: just plug and play. SEQUENCER steps mode with 8 levers from lower to....
-
-
Remember that the circuit will fit tightly, so you will not have to glue it. Try several times to put it inside. Modify it bit by bit, and when it enters with a little effort but does not move you have the right size. put the whole circuit inside the servo,....
-
Simulation schematic for astable multivibrator Parameters Vcc=24 Vol=1 Voh=21 Power supply Vcc Vcc 0 {Vcc} Time constant R1 Vo Vc 1K C1 Vc 0 100n. IC V(Vc)=0 * *Reference R2 Vo Vr 100K R3 Vcc Vr 100K R4 Vr 0 100K * *Comparator E1 Vo 0 Vr Vc table=(-1m {Vol}....
-
When designed with general purpose small-signal transistors, the bandwidth is 50MHz to 250MHz so very careful grounding and power supply decoupling is required. Simulation schematic for 2 transistor buffer. *Copyright Poul Petersen 2009 * *Some standard....
-
-
-
-
-
-
-
-
A Simple yet Versatile Dimming-Ballast Solution for Low-Energy Lighting EU-wide legislation promoting use of Compact Fluorescent lamps (CFLs) in place of incandescent bulbs could save as much....
-
Class D audio amplifiers are now geared up to replace class AB An integrated high voltage audio driver facilitates the design and construction of a high power....
-
Using the new VIPer12A and VIPer22A software To supply the large number of electronics components required for home appliances, different power supply topologies can be used. We....
-
The story of a PAR 38 LED spotlight design Delivering real-world LED lighting systems that live up to their billing reduced power consumption, increased life, improved....
-
Integrated solution for two output channels simplifies design and enhances reliability The device, the VNI2140J, integrates on-chip two 45V Power MOSFETs channels (80mOhm typical Rds(on) at 25....
-
In this article we show that enhancement mode GaN transistors enable significant efficiency improvements in resonant topologies and demonstrate a practical example of a wireless power transmission....
-
-
High linearity analog optocouplers provide the versatility required to meet a wide range of analog isolation needs. For designers of high voltage applications, high linearity analog optocouplers can reliably send analog signals across very high voltage area....
-
Reduce the IC s supply current for about 50% This article presents a high reliability 1200V High Voltage Integrated Circuit (1200V HVIC) for half bridge driver applications. It....
-
Dimming function opens up a completely new family of CFL applications Compact fluorescent lamps (CFLs) are replacing incandescent light bulbs at a rapid rate due to their....
-
Small additional circuitry during standby can boost efficiency tremendously In a modern car several microcontrollers for safety, navigation, entertainment and comfort electronics have to be supplied. Most....
-
Cooking with Induction Heating Technology Induction heating is a well-known technology and very commonly used for cooking appliances because of its high energy efficiency. The single ended....
-
To ensure that power electronic components are reliably protected from the effects of non-permissible operating conditions, fast and reliable error detection and effective protective measures are needed....
-
This article focuses on a minimal resource microcontroller implementation for a 3 phase BLDC motor, closed loop speed motor controller application based on a Microchip PIC12 device. It shows how minimisation techniques can reduce the number of I/O pins to....
-
The ability to reduce power losses is most important Describing here a new ultra-high-performance topology expected to be the foundation for next-generation dc-dc power supplies in high....
-
Both help improve efficiency and protect micro-inverters in PV solar applications In 2009, the residential solar photovoltaic (PV) inverter market represented 90 percent of the total PV....
-
Dynamic progress A change in technology is taking place in power factor correction. Static PFC systems are being progressively replaced by dynamic systems that offer new technical....
-
Using Integrated Switching Regulators When it came to power supply design, most Engineers would scratch their head thinking, œWhere do I start? Decision must be decided concerning....
-
The absence of compensation simplifies development and testing. The number 6 billion turns up often as the number of cell phones in use worldwide. Published estimates average....
-
Comparing the performance of 1200V silicon carbide (SiC) MOSFETs with 1200V silicon MOSFETs and IGBTs at high frequency is critical to establish the difference in device losses and power-handling capabilities between the technologies. Using a demonstration....
-
The SiC MOSFET also has significant advantages including simple drive circuit The silicon carbide (SiC) MOSFET has unique capabilities that make it a superior switch when compared....
-
Integration of 1200V SOI gate driver ICs into a medium power IGBT module package A novel approach for medium power....
-
The drop-down category menus above may help you find what you are looking for. Be sure to also look under the Bodo`s Power by Topic sub-categories. They include topics similar to our general categories. If the above suggestions were of no help, you can....
-
A Practical Application for Cyclone V FPGA Power Requirements The integration of multiple power modules on a single power board allows for specific load requirements to be....
-
This type of circuit can never be used in a load-share configuration Synchronous rectification is one of the best ways to improve the efficiency of the low-voltage....
-
More Flexibility For Low-Power Synchronous Buck Converters Modern synchronous buck converters for portable applications provide so called power-save mode operation to maintain high efficiency over the entire....
-
LEDs simply react a lot faster than conventional bulbs Light dimmers for common bulb based lighting have been around for ages. The most common implementation of such....
-
Fully illustrated and schematised plans for a high performance, easy to build transistorised high voltage flyback driver....
-
-
A thyristor is like a diode; it can pass electricity in a forward direction but, blocks it in a reverse direction. The difference between a diode and a thyristor is that the thyristor is a three terminal device consisting of an anode, cathode and gate, which....
-
-
The NES version of this hack is very similar to the SNES version and I recommend reading that article first to get a general idea of how these controllers are assembled. The first item you`ll need of course is an original NES controller, which you can....
-
There are battery powered wireless systems on the market, but the ones I found would signal that the door was open even if you left it open just a few inches for ventilation. I wanted a system that would alert me if we`d just plain forgotten that the door....
-
This is my first post and I`m desperate. I bought a used model# 110-2079 gap bed 18 speed lathe with an American motor on it. I didn`t realize....
-
I have a NOS lathe with NO history. Period. I think it was maybe purpose-built. In any case, I mention it because there is really no "tech-support....