Top Circuits Page 188
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I have finally worked out this schematic as an exercise to learn about amps. There are a number of things i am not so sure about and would appreciate....
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i have a fujiya fl-555 (schematic attached) that i am having problems with. the recorder`s volume is very low even at maximum setting. it was working....
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An amp that uses 211 or 845. It puts out just over 40 watts. The tube must run in A2 to get this power, which is not a problem with a good driver. The secret is a good follower, you use a 6BQ5, I use a mosfet. You use 7K ohm load on 1000 volts, I use 10K ohm....
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Hi, I`ve been looking to add a simple 3 band parametric EQ to a tube bass preamp. My initial idea of making a simple OpAmp based EQ isn`t going to fly ....
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i have a tandberg 74b that i just received second hand - everything on the inside is original, excluding previously replaced tubes. when it first....
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Hello, everyone, new kid on the block here After some tube amp reparations, fixes and minor upgrades (re-capping, fixing bias problems, various....
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Experimenting with a vacuum tube VCO similar to the one in the link below, but with a few modifications to accommodate the parts I had on hand; I`m using a cascode arrangement instead of the 6AU6 and a 2D21 thyratron in lieu of the 5696. The circuit really....
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A fully parametric tube EQ and my best bet seems to be `merging` these two schematics into one so that i can get a tube-based gyrator section (with adjustable Q, Freq and Gain) and use ICs for the input and follower stages (going to use this on a home-built....
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The edcor that seems to make more sense would be the GXPP15-8-8K EDCOR Electronics Corporation. GXPP15-8-8K You are right, Jeff, the little price....
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hi everyone, my name is mike, i come from a small country called new zealand- i am currently planning to build a 6l6 push pull stereo power and pre....
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There is a mod to the RC delay circuits some of you may want to consider. If you wish to have a shorter discharge time so that the circuit restarts....
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Hey Guys, I`d like to build a analog summing amplifier. Perfect would be with tubes. I want to get the typical tube sound, if it`s possible. So I want ....
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Originally Posted by taj Is he perhaps more accommodating than his reputation portrays? ..Todd No....
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I`m building a tube/MOSFET hybrid power amplifier based on a circuit in AudioXpress by Cozza (5/01) which in turn is based on a design by Borbely....
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Part of the difficulty is that multiple caps/resistors are in the circuit in RIAA. This is based on the Harman-Kardon schematic: I don`t have the Cit IV info handy, sorry. but there are so few parts in a Cit IV that it`s easier just to replace them all. If....
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This schematic is modified from an old Bell & Howell projector amp for model 302 - PP 6v6`s with a 12AU7 PI. Can anyone identify the PI circuit It appears closest to "floating paraphase" to me. My only complaint with this circuit is that I`d like more clean....
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I have looked in all the usual places and can`t seem to find one? Pilot 505. It has a 5AR 4,-4-,EL84`s-and 2, 12AX7`s. Thanks for any help you may....
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Originally Posted by ide2003 Hi intensate, I`ve been in your shoes before. If you want no op-amp all together I highly recommends you to have ECDesign`....
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I build the CAT SL1 preamp with the attached schematic Noted that the gain of this circuit has about 26dB. I noted that the new SL1 have an option....
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Hi there - i`m a newbie here so please be nice if I tread on any toes And please take a deep breath - I have a fair bit to say, so go get some popcorn ....
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Hello Bottleheads, I am building this gain stage from Decware`s Zkit4 to use as a buffer in front of an LM3875 gain clone. The chip amp has plenty of....
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I have an almost mint condition Fisher 800b hi-fi amplifier that I want to convert into a mic pre. All of the power supply SS diodes need to be replaced with modern, low noise parts. All electrolytic caps. need replacement. The signal caps. may still be....
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The comment on using the existing phono connector was to not really change anything at all. Just replace the electrolytic and paper caps, add the 3-wire line cord and use the radio as-is. The selector switch on the radio probably has an "Aux" or "Phono"....
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Originally Posted by artosalo My original claim was that pentode connected version is not optimum. NO! You wrote the Mullard 5-10 is not optimum. If....
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Hi, does somebody have a good 211 / VT4C schematic like Air Tight ATM-211 to recommend ? If it`s possible without interstage transformer and 6SN7....
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Hi! I want to DIY a 300BSE power amplifier recently, could somebody recomend or provide me a wonderful and robust schematic??? I will use Lowther PM6....
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I plan on building a ""high power"" amp using the KT88. Found the following circuits: 1) Which will be the better quality one to build? 2) Are ....
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Too much of a good thing can confuse you. I started out looking to build a simple 15W triode / 30W Class AB1 pentode PP amplifer. Class AB1 = because....
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This design is based upon an ECL86 Amp design posted by Yves quite some time ago. This design uses shunt feedback to reduce the output stage rp and thus better drive the limited primary inductance of cheaper output transformers. Regardless of that, the....
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The +/- 3 dB point for the treble is about 2, 5 KHz, with about 12 dB boost/cut at 10 KHz. Perhaps you should check the wiring (again ) or perhaps componentvalues Do you have access to a signal generator yeah i checked wiring and components again and again,....
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hi i m wanted to start building a tube compressor for my bass guitar , i found a compressor schematic with two ecc83 , but it seems it s too old ,and....
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Very interesting points Chris and Thoersten, but I`d like to make a little step back. So, talking about my lastest design, this schematic attached....
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or take one FET, one Zener, and one resistor. No FET and resistor needed if the current is in the range of specs for a zener. Or take a P-channel....
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Hi guys I have recovered these beautiful valves from an old television destined to scrap. From this I have saved the 6CU6 (h.deflection) and a double....
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Schematic for the CMOS Linear Feedback Shift Register Vintage Atari Sound Effects Generator circuit....
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A simple 2 Transformer, 4 Germanium Diode Ring Modulator with a true bypass switching scheme. Includes input for Carrier Wave modulation. Power is only required for the status LED...
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Using two of the most basic oscillators you can DIY, this particular circuit works great to modulate our main LFSR circuit. It also sounds pretty cool on its own. The main noise generator for our circuit. The basic circuit at play here is a Linear Feedback....
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I have an Onkyo TX2500 mk II receiver that I`m hoping to fix up for a friend, which is not working properly on AM or FM. Tuning to AM gives low....
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I am wiring a three phase motor through a two pole vacuum switch. two lines go through the switch but one line is always hot to the motor. is this proper or is this a safety issue?....
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This circuit is used J-FET for recieve signal to buffer from LED, About Output voltage, We used IC 1458 or LM1458, while in the dark is about 7 volts and the drop about 2 volts in full sun. The LED voltage buffered by a junction FET transistor and then....
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This simple and cheap circuit is not just for Christmas! There are just two resistors, a small-signal transistor such as a BC547, one flashing` LED and a string of normal` LEDs. The flashing LED works as an oscillator and switches the transistor on and off;....
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The UM3561 contains programmed mask ROM to simulate siren sound. Power consumption of IC is low. It is powered by 3 Volt. One NPN Transistor is used for amplification of audio signal...
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This circuit is built around a 555 timer using very few components. Since the circuit is very simple, even a novice can easily build it and use it as a controlling device. A laser pointer, now easily available in the market, can be used to operate this....
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A circuit of an off-line telephone tester which does not require any telephone line for testing a telephone instrument. The circuit is so simple that it can be easily assembled even by a novice having very little knowledge of electronics. A telephone line....
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A simple technique for measuring frequencies over quite a wide frequency range and with acceptable accuracy limits using a PC. It follows the basic technique of measuring low frequencies, i. e. at low frequency, period is measured for a complete wave and....
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We know that every inductor coil has a certain amount of resistance and the coil should have lowest possible resistance. The ratio of the inductive reactance to the effective resistance of the coil is called the quality factor or Q-factor of the coil. A high....
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This FM spy telephone circuit is mounted serial with the phone line. When is signal on the wires this transmitter will radiate airwaves thru the wires which act as antenna. There is no need for batteries because it got his voltage supply from the phone....
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A flushing toilet is something that most city dwellers take for granted, but it can be a luxury for those who live away from utility water and electricity. This circuit provides on-off pump switching for a small 12 Volt pump that is used to fill a toilet....
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This circuit is used to measure the voltage on a 12V (nominal) lead acid rechargeable battery system. It was specifically designed for use in solar powered systems, but is general enough that it can be used for automotive or other 12V systems. Lead acid....
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The three port valve is a masterpiece of clever engineering, in that it manages to move to one of three positions using only a cheap non-reversible AC motor, a spring, a couple of micro-switches, a resistor and a diode, and act as a relay for the boiler into....
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This color changer mixes light from high-power LEDs to create more than 16 million colors. A smooth auto-fader cycles the colors, or you can hook it up to a USB port and control it from your computer. This color changer borrows a well-known color model used....
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The signal from MSP430 PWM pin isn`t quite ready to drive a speaker or amplifier. First, we can clean up the signal a bit by running it through a low pass filter. This clips the sharp edges from the PWM waveform to make it sound a bit more natural. You can....
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This project uses a small, common electret microphone to convert audio to an electrical signal. These are the cheap microphones found in most PC headsets. The microphone output must be amplified and zeroed before it can be recorded with the MSP430. This is....
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The diagram shows a set of cell diode capacitor connected in series, each set of increasing voltage 300 V. This Supply generates DC high voltage 40kV, with which you can make interesting experiments. With the available 40 kV capacitors, 160 kV output voltage....
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A small biped walker made of 2mm plywood. Powered by two RC servos. it is a popular microcontroller, easily available and programmable now as flash microcontroller 16F84. This simple circuit can be used to program the PIC16F84 and similar "flash memory" type....
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The ZN414 is a low cost, single-chip AM radio integrated circuit. Launched in 1972, the part was designed and supplied by Ferranti. Receiver CircuitThe TDA7000 is a monolithic integrated circuit for mono FM portable radios or receivers where a minimum. Take....
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Fires the slave flash exactly when the main flash occurs. Some flash settings on digital SLR`s are not compatible. Long battery life, 300 hours of use or more. If not turned OFF after use, the unit will shut down after 15 minutes of inactivity. Battery life,....
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This pdf file shows the schematic diagram of my home-built circuit to drive the PDR-56 probe. A JKL BXA-12579 inverter commonly used to drive cold-cathode fluorescent lamps is used as the high-voltage power supply. The BXA-12579 produces 1, 500 VACRMS for a....
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The Cockroft-Walton multiplier uses a cascaded series of diodes and capacitors to generate a high voltageDC potential from anAC input through acircuit topology thatuses diodes to charge capacitors in parallel and discharge them in series. The output polarity....
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Transformers made for powering large neon signs are inexpensive and very reliable. Most commonly, the secondary is center-tapped, which prevents the use of its full peak-to-peak output in applications where one of the terminals needs to be grounded. In the....
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As shown in the block diagram above, the 10 MHz signal is produced by an oven-stabilized 10 MHz crystal oscillator that is locked by a phase-locked-loop circuit (PLL) against the precision 10 kHz signal generated by the GPS receiver module. In addition to....
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This projects will describe a simple Servo Reverser that can be cheaply built using a CD4001 NOR gate, 4 resistors, 3 capacitors and one variable potentiometer (see schematic below)...
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First you will have to use a opamp like ne5532, than calculate the frequency you want on each block(on block for flat, one for bass and one for high), don`t forget to put a buffer on the first stage, you can use trimpots or fixed resistor and some bottons to....
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Try the 2N388A transistors as they are dirt cheap (18 cents when bought in lots of 5 or more I think). The 2N5088s can be readily found through Mouser. The rest is pretty much Radio Shack or your local store. Convert to PNP transistors by changing the....
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The JBL "Bass Wave"amplifier is a small 100-watt amplifier with built-in active filter with a single-pole high-pass at 10 Hz combined with a single-pole lowpass at 85 Hz. It costs an amazingly low $50 US. It also comes with line and speaker-level inputs and....
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When starting with Arduino, one soon has much more Arduino boards then RS232 or even USB ports on the computer. So that, it seems more useful to put the signal level converter to an external adapter than directly on the Arduino board. Usually, one has (I....
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The receiver is a tripple superheterodyne receiver with two PLL-guided local oscillators. The first LO (2. 1 GHz) can be set in steps of 500kHz and sets the RX signal down to 188 - 188. 5 MHz. It has a high PLL loop bandwidth of around 20kHz, therefore gives....
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Had developed the 7 MHz CW TRX for my first trip to the US. The receiver worked very well. (Actually a lot better than here in Europe since they do not have high power broadcast stations on 7. 1 MHz. ) The transmitter is also quite ok. 1. 5 Watts is not a....
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The preamplifier is very simple. I used a Low Noise integrated circuit manufactured by Hewlett Packard. The device name is MGA86563. It has a Noise Figure of about 2dB and can be used from 0. 5 GHz to at least 6 GHz. The gain is about 20-22dB at 2. 3 GHz.....
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A couple of few years ago I had build a diode-sensor based RF powermeter using a 68HC11 microprocessor. Even before that I had build an analog RF powermeter with thermal power sensor. And I found datasheets of logarithmic amplifiers very interesting, that....
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The AT90S1200 RISC Microprocessor (AVR family) is a very neat component to program a PLL synthesizer or for doing other rather trivial tasks in a radio circuit. It is reasonably cheap, easy to program and a nice integrated development environment is....
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This is a great contribution to the ongoing study of the lock control module, including instructions and photos of how to upgrade the module to reduce its standby current consumption for increased battery life. Assumes that you are slightly competent with....
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Is a capable tube tester, yet its use scenarios can be multiplied with only modest efforts invested in understanding its schematic, regimes, and ways to add new regimes. Eico 666 is capable tester, known to be able to supply voltages and currents adequate....
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This article describes how to build a simple inductance meter. The PCB layout is included....
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This article describes how to build an opto-isolated power switch for controlling heavy loads with logic levels....
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This article describes how to build a simple uC based delay circuit for photographic applications like drop or high speed photography. It can be used to control the trigger lag of cameras and flash units, generate a periodic trigger pulse or even control....
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This article describes how to build a simple uC based delay circuit for photographic applications like drop or high speed photography. It can be used to control the trigger lag of cameras and flash units, generate a periodic trigger pulse or even control....
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This site describes how to build a low-budget DIY Canon RC-1 infrared remote control clone based on an AVR microcontroller....
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This article explains how to build the second improved version of the HDR-Jack. In contrast to the original circuit this version is powered from a lithium coin battery. This results in compatibility with cameras not supported by the first version, because of....
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Step-by-step instruction to build a AVR based versatile camera trigger with functions like: lightning trigger, sound trigger, interval trigger, slave flash trigger, bulb mode ....
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This is the project home page of the SmaTrig 2. 1, the improved version of the the SmaTrig 2. On this site you will find complete instructions how to use and build the versatile and compact (27 gram) 15-in-1 camera trigger SmaTrig 2. 1. Everything needed to....
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This acticle describes how to build a simple yet effective sound trigger for cameras or flashes. The circuit allows to experiment with high-speed photography....