Top Circuits Page 217
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How to use the Galleon System modules to build a radio time receiver to use the 60 kHz MSF time signal from the atomic clock at Anthorn Cumbria....
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The basic principle of the theremin is theheterodyne oscillator. When I started developing the Open. Theremin I knew that I needed a stable and reliable oscillator. So I searched the internet and found various schematics with different components. I built....
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Hey! It`s another ESQ-1 repair thread! I got an ESQ-1 tonight for a very good price, and I totally expected it to have a few issues. And it`s got them....
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Here`s one for anyone else out there who likes to tinker; this is a fun project with a low likelihood of you destroying your unit. That said, you....
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I would like to make a portable (battery powered) mic preamp based on the IC THAT1510. I am attaching the basic preamp circuit given in the THAT1510....
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Im working to build the CountryHick DI as shown on DIYFactory, with a couple of minor modifications. Eventually, This is going to be a 1u unit with 4....
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Hi there, I have a preamp circuit that is part of a powered subwoofer that is making a static/popping noise. It sounds similar to the scratchy, dirty....
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I`ve just bought a mixer without a PSU. I don`t really need the 48V phantom, so can I just use an 18V DC wall wart type PSU? If yes, which pins should....
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Hi I am looking to add a simple wet/dry knob to a gssl (actually chameleon labs 7720) for parallel compression. Came across this schematic - it seems....
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So I`ve searched the forums, and the internet, and I`ve put together a schematic for a 16 channel passive summing mixer I would like to build. I`m....
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Dear geekslutz, I have been sort of mucking about modifying my cheap mxl v67s to have a good enough condenser to tide me over until I can afford to....
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Hey guys, apologies in advance for the wall of text, but this is a diagnostic problem and I felt I should include as much info as possible for those....
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Hi I have decided to build this mic preamp and tone control circuit which was posted on a another site. The Eq section is the same one used in the....
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Hello. You seem like people who know their stuff. I`d appreciate you looking at op amp - Humming and Transmission issues - Electrical Engineering and....
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Hi Sluts! long time lurker here, a while ago i bought 4 of those old amps for the case, and with my limited knowledge of old equipement, i never realy....
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Hey all I`ve got a paper this year in (active) electronics. I`m in the second year of a bachelor in audio production. Our main project will be to....
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Hi all, i`ve recently bought the dantimax thatmic pre amp and i was wondering if anyone could point me in the right direction to install a vu meter....
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Hi I am currently working through the prototype of my first guitar pedal. I am having issues with the input buffer, and I would like someone to look....
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I just finished a Drip Pultec V2. Checking the EQ curves in spectrafoo I noticed an anomaly. The 20, 60 and 100hz curves appear as expected but the 30....
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In that article I wrote about how I used an Arduino to create an interface that would allow me to directly control my fireplaces from my home automation system. That solution worked great and I was successful in running two fireplaces from the single....
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Later in the sixties, the first distortion effect boxes were made to simulate the sound of razored cones and overdriven amps. Now, most amps have a distortion control, but distortion effects are still popular. Now we`re going to discuss the methods of....
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The conception of this project is directed to the study of the environment response due to a human action. Based on that subject, an environment was prepared with several visible rays of laser. If one of theses rays is interrupt (eg. someone crosses it), an....
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Whether you are considering a backup power system, want to add another electric circuit, or are going to install a new appliance, it is important to understand the home`s electrical wiring basics and applicable codes. First, let`s briefly review how....
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This amp had hum and nosise. So I added cpacitors at power supply, but Voltage was high. There was spark at final tube socket pins. So I pulled off capacitors...
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It lights on the high-brightness LED even at 0. 8V if a battery can feed the circuit 93mA at 0. 8V. The step-up efficiency from 0. 8V to 1. 5V is 75% in average and the peak efficiency (83%) is located at a voltage around 1. 1V. The circuit consists of very....
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The AVR Basic Infrared Transmitter is a sister project for the Basic Infrared Reciever. The emphasis here is on "basic" because the simplest version can be built using only 10 discrete components and a typical AVR microcontroller. Taken together, these two....
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In interfacing AC loads, isolation is very important. This because an interfaced circuit that do not isolates the computer from the AC load have chances that the computer will be so much affected if ever the interfaced circuit will fail or be destroyed.....
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The hardest part of the build was to find and / or design a circuit that could handle the load and still stay with in my budget. This little circuit does both. It varies the power output with one potentiometer (variable resistor) R1. R1 is a panel-mount pot....
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In the circuit shown below i have configured the LCD module Command Register at address 00H and Data Register at 01H, so when ever we will write the data at address 00H, it will be considered as command for LCD, and when ever at 01H, it will be considered as....
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This diagram shows how an internal SoftV92 Data Fax Modem interacts with phone line. The modem is from Zoltrix but a Conexant utility says it is a "Churchill Data Modem". This schematic may be useful to fix a similar modem...
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A clock using numeric neon lamps, also known as nixies. These display devices were common around the sixties and seventies and their use fell off after the invention of LED displays. Nowadays nixies have become valuable oldies and are hard to get even tough....
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The circuit below is a standard oscillator of the Colpitts variety. Similar circuits have been used in many ham radio homebrew transmitters. This particular circuit should function well at frequencies from 1500 kHz to 8000 kHz. For use on lower frequencies,....
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The Poppet" is a half-watt AM transmitter designed by Mr. Doug Gibson of England. The original design was published in issue 84 of SPRAT, newsletter of the GQRP Club. The version shown here incorporates changes suggested by Steve Hartley and others. Although....
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The standard Class AB audio power amplifier allows for direct coupling of the output of the amplifier to speakers. This is very good in that no capacitors or transformers get in the way of the sound quality coming out. The speakers are connected directly....
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Everyone is familiar with the sound of a wah pedal. This is a resonant peak in the signal that can get moved around. Not so familiar is a notch, or a sudden reduction in level at one frequency. Sometimes a notch can be very useful in getting a specific....
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The Tube Screamer series of distortion/overdrive boxes from Ibanez has a reputation that has led them to pass into musical urban myth. Helped along with Stevie Ray`s use of them, the TS 808 and TS 9 have been sought after and traded up to astronomical....
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It is a hansom battery portable radio with a roll top and even today it looks beautiful. When I was first given the radio it didn`t work. It had a burned out detector tube and I had no idea where I`d get a replacement for it. Most importantly, the radio....
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I had never worked with " common base" or "grounded base" designs before and you know, I still don`t understand how they can amplify. Another thing, I had never used a bipolar transistor in a regenerative stage before, but had read that the amplification....
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Experimenting with the window motor. The reason the window motor is so powerful, is the minor current required is an INDEPENDENT VARIABLE from the power of the permanent magnets on the rotors. The true power lies in the magnetic flux lines of the permanent....
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An AM modulator for the MW band that will allow hearing the music of a CD or MP3 player during daytime on such radios. This is not a transmitter: the output power is very low (only 10mW) and is intended to be connected to the antenna input of the radio, or....
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The circuit interfaces a commercial DCF77 receiver (available for about $15) with a PC using the RS232 serial port. By rewriting the program and/or modifying the circuit it`s possible to use also different systems or different I/O ports. The power is driven....
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A box full of Geissler tubes and a Ruhmkorff coil. He said his grandfather built the tubes by blowing the glass around 1900, more than one century ago! He wanted to see if the tube still worked, but a first attempt of powering them with the original....
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The circuit of this device is quite simple: an input circuit filters the signal provided by the antenna to reduce sensibility to other phenomena and protects against over voltages. The four transistors realize a "one-shot" section that is triggered by the....
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This document describes a simple SWR-meter suitable for long and medium waves bands (137 and 500kHz). The design is nothing new and very similar to common short wave meters, but it has been designed to work with low frequencies. The majority of amateur radio....
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Even if a fluorescent tube it`s not a neon glow lamp and this page it`s not maybe at the right place, this circuit is very interesting because it uses an odd way to power a very common lamp. Like glow lamps, neon tubes are composed by two electrodes in a low....
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Neon glow lamps can also be used only for their U/I characteristic and not for producing light. These lamps are electrically very close to diacs: no current can flow through them since the voltage is lower than a trigger value (about 70V for neon glow lamps....
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To obtain such a monitor it`s enough to connect a resistor in series with the bulb and connect at a main outlet. The resistance of that resistor may vary on the type of bulb and the main voltage but it`s not critical: about 150K © for 220. 230Vac and about....
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A VU-meter is a very common instrument usually installed on audio Hi-Fi amplifiers and is used to show the instantaneous power provided to the speakers. It is usually connected at the output of the amplifier, in parallel with the speaker. The term "VU"....
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This is a quick how-to guide for making a stereo VU meter using the LM3915/LM3916. The LM 3916 is an integrated circuit (IC) that takes analog voltage levels and drives 10 LEDs, LCDs, or vacuum fluorescent displays to represent digital voltage levels just....
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This intercom box takes input from any 2-way radio (FRS, GMRS, etc), cell phone, and a stereo audio source and amplifies them for listening via a headset in your helmet. The headset is a modified Chatterbox stereo headset. The standard Chatterbox mic is....
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A used USAT F3A found it`s way into my possession today. I wasn`t planning on this, it just sort of happened. However, now I have another loco for the GIRR. The road number of the model is 26C. By the ATSF numbering scheme used at the time, this would be the....
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The streamliner passenger car came into existence just before W. W. II as parts of dedicated passenger car and locomotive consists. They were designed to be lightweight to allow high speeds with a single rather small diesel engine. Eventually the railroads....
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This page is a revised version of the original submission of an article entitled "Better Bachmann Sound For Under A Buck" published in the Feb. 1998 issue of Garden Railways Magazine. Editorial changes and additional artwork that might have been added by....
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This page describes the installation and use of a Soundtraxx Sierra sound system. The Sierra worked quite well and was reasonably priced, but time marches on. As of September 2008, the Sierra went out of production and was not replaced by an updated stand....
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The main reason to go to the trouble and expense of running trains on battery power is to avoid cleaning or even wiring the track. The issues of track cleaning really can be a big deal. Adding radio control to a battery power system adds the capability of....
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The EMD SD45 was manufactured starting in 1965 so that it represents one of the newest prototypes available in Large Scale. SD45`s are still running all over the country, but they are getting fewer over time due to very high miles in the last 30 to 35 years.....
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The Universal Serial Bus (USB) has become a popular method of connecting computer peripherals. The original USB 1. 1 specification limited data rates to about 12 Mbits/sec. The updated USB 2. 0 spec increases those rates to up to 480 Mbit/sec. Both versions....
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I built my own Lo-fi Arduino Guitar Pedal. I`m even using a similar enclosure work tossed out a couple of thinwire->twisted pair converters that I snapped up. I think the only major deviation is that mine only has one output at present- I could add a second....
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The purpose of this robot is have a bot that can go around and map out a single floor of my house and then use that map to intelligently traverse the mapped area. So far I`ve only written some diagnostic software to verify all the subsystems of this robot....
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This is a common control voltage in industrial and telecommunications equipment, so the relays are common in surplus equipment. Many will actuate equally well on AC or DC, which makes them an easy solution when the control voltage is switched mechancially,....
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Signal conditioning is a set of operations performed on a signal that makes it suitable for interfacing with other devices or systems. Signal conditioners are the actual devices that perform this operation. These devices have an input and an output. Normally....
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Mixed Analog/Digital Design Using Split Power, Ground Planes The next example shows how to design a circuit with a mixture of analog and digital parts with multiple power planes and with a single ground plane split into analog and digital sections that have....
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A control program usually requires more than turning outputs on and off. They switch on and off because an event has happened. This event is then connected to the input of the microcontroller to "tell" it what to do next. The input could be derived from a....
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Although there are significant variations between different implementations of the general-purpose timer in different microcontrollers, there are many similarities in the principles of operation and the structure of the timer subsystem. The central element....
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The microcontroller is an AT90S8535-P in a DIP40 package. Note that this microcontroller is pin by pin, hardware compatible with other members of the analog series of AVR microcontrollers, like ATMega8535 and ATMega16. However, there are many differences....
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This chapter contains the description of a simple development board for the study of the 8051 family of microcontrollers Unlike the development boards dedicated to the HC11 and AVR families, presented in the previous chapters, this project allows the user to....
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Analog-to-digital converters are classified into one-step architectures, such as: flash, folding and interpolative topologies, and multi-step architectures, such as: Successive approximation and pipeline topologies. The flash architecture is potentially the....
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The power supply is a vital but often neglected part of any electronic product. It is the interface between the noisy, variable and ill-defined power source from the outside world and the hopefully clear-cut requirements of the internal circuitry. For the....
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A central door locking system permits all doors, often including the boot lid or tailgate, to be locked centrally from the driver`s door and, normally includes the front passenger`s door also. The locking and unlocking action is produced by an....
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The open-loop concept of oscillator design is often met with considerable skepticism by engineers familiar with classic oscillator terminology. For comfort consider Figure 2-4A where the oscillator cascade is drawn with only the RF components. Next, the....
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A popular circuit known as a Hartley oscillator. Its identifiable feature is the tapped coil in the LC tank circuit. Notice that the coil`s tap point is grounded. The amplifier portion of the oscillator is a common-emitter amplifier. Therefore, the ac base....
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This example shows how to design a circuit with a mixture of analog and digital parts, multiple power planes, and a single Ground plane split into analog and digital sections that have a common reference point....
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This example demonstrates how to stack up layers and design transmission lines for a high-speed digital PCB. The example also demonstrates how to create a moated ground area with a bridge around a high-frequency crystal oscillator, how to perform pin/gate....
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The first switching LED driver that we will study is the buck converter. The buck converter is the simplest of the switching drivers, and is a step-down converter for applications where the load voltage is never more than about 85% of the supply voltage. The....