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The LM378 dual power amplifier is used as the spring driver. The recovery amplifier is a low noise dual preamplifier..

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The system can be used to synthesize a stereo effect from a monaural source such as AM radio or FM-mono broadcast..

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This circuit uses an SAD 512D (Reticon) chip, which is a 512-stage analog shift register. By varying th..

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This is an image Schematic. No Description available...

I recently prototyped a Tube Screamer type circuit to refresh my memory about the sound of this pedal. I used a borrowed TS-808 and a Pro Reverb in the mid 80s for several weeks while my modded Twin Reverb was being fixed and I remembered it sounding pretty good for a pedal, but not as good as the Twin. The Twin had a Boogie style preamp using the normal channel, so this isnt a big surprise. Anyway, now that I know how all this stuff works I decided maybe I could get more.....

Spring reverb units are most commonly used in guitar amps, having been replaced by digital effects in most other areas. This cannot really be classed as a "real" project, because the circuitry is somewhat experimental, and may change quite dramatically depending on the type of spring reverb unit you can actually get your hands on. The one I have is an Accutronics (they are still going, so check out their web site - see below), but you might already have one, or can get.....

Blue VALUES replaced by values in RED. Blue COMPONENTS removed from circuit. Red components added to circuit...

This spring reverberation unit comprises three identical main sections each of which contains an Accutronics type 9 spring reverb tank with short, medium and long decay times. Controls are provided to adjust the amount of signal arriving at the output from the input directly and from the spring tank. Conventionally these signals are called "dry" and "wet." A feedback control allows the tank output to be returned to the tank input to produce oscillation effects. The.....

In The Studio: The Hot Springs tanks and circuit board should be mounted in a location that is free of ambient electro-magnetic fields. The input and output jacks are typically placed on a patch panel with other effect's inputs and outputs. In use, the effects or aux send buss of the console patches to the Hot Springs input and the output of the Hot Springs returns to one of the mixer inputs for control of reverb level in the total mix.h..

The type of this Surround Processor is generating the surround effect with processing two channels of stereo source. Most of those are generates the surround effect with separates reverberations from source signal and applies any processes, and then mix it to front channels or output as rear channel...

The Surround Sound Processor (Project 18) is a standard Hafler matrix, and will provide a passable rear channel signal. In order to confuse the brain, we really need to delay the signal, which makes it sound as if it were further away. This principle is used in virtually all commercial units, but they have a tendency to be somewhat more complex than a simple passive unit. The digital delay presented here is expected to be sufficient for most applications, and although the.....

Peak reading meters, popular in Europe for years, are just now coming into greater favor in America, and for good reason. The main purpose for having a VU meter is obviously to monitor signal levels going to a tape recorder, reverb unit, or some other level-sensitive device, to help optimize the signal to noise ratio of the audio sent to the device...

This circuit was inspired by a friend who wanted a reberb for his portable guitar amplifier. I originally tried using NE5532 low noise op-amps for the buffer stages but they were too noisy for the low level circuits so I switched to discrete 2N3904 transistors, they seem to be fairly quiet. This circuit has a nice feature not found in most reverbs, a drive control for the spring amp. The drive can be turned way up and a nice smooth distortion effect will come out.....

This is my second-generation guitar reverb circuit. The fidelity is much improved over the earlier design, it is suitable for use as a front-end to a guitar amplifier. This circuit features clipping indicators on the preamp and reverb recovery stages, allowing for the optimal gain settings. The guitar input stage is a class A amplifier with adjustable bias. A 2N3906 PNP tranistor is used for a low noise design on this stage. The output of the preamp stage is sent to three.....

This is the second generation of a circuit for a guitar spring reverb pedal, it has dry, wet, and drive controls for a wide variety of sounds. With a decent reverb spring (tank) in overdrive, this circuit will produce an incredibly thick and grungy sound, build one and be the envy of all of your guitar playing friends. This thing is fun to play through. This circuit is here for historical purposes, it is recommended that you use the much improved..

This is a simple Surround Processor with the degital delay method. This audio processor is not using any special function ICs that difficult to get parsonaly, and desined in only general purpose ICs. Of course the Digital Delay Block of A-D, D-A and delay logic is also using only general purpose ICs. This is the key feature that easy to build it. The type of this Surround Processor is generating the surround effect with processing two channels of stereo source. Most of.....

The Hot Springs tanks and circuit board should be mounted in a location that is free of ambient electro-magnetic fields. The input and output jacks are typically placed on a patch panel with other effect`s inputs and outputs. In use, the effects or aux send buss of the console patches to the Hot Springs input and the output of the Hot Springs returns to one of the mixer inputs for control of reverb level in the total mix.h..

This circuit features clipping indicators on the preamp and reverb recovery stages, allowing for the optimal gain settings. The guitar input stage is a class A amplifier with adjustable bias. A 2N3906 PNP tranistor is used for a low noise design on this stage. The output of the preamp stage is sent to three places: the output mixer amp, the reverb driver amp, and the input clipping detector. The reverb driver amp consists of a phase inverting push-pull circuit made from.....

This is my second-generation guitar reverb circuit. The fidelity is much improved over the earlier design, it is suitable for use as a front-end to a guitar amplifier. This circuit features clipping indicators on the preamp and reverb recovery stages, allowing for the optimal gain settings...

Peak reading meters, popular in Europe for years, are just now coming into greater favor in America, and for good reason. The main purpose for having a VU meter is obviously to monitor signal levels going to a tape recorder, reverb unit, or some other level-sensitive device, to help optimize the signal to noise ratio of the audio sent to the device. Too much level will produce distortion, and too little results in the inherent noise of the medium becoming a problem......