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Category: Circuit

Aural Exciter Makes Your Sounding Real

Published 23/01/2017 by H&G Amplifiers

Aural Exciter since the 70’s.

Do you know that feeling when you’re playing on guitar however you’re missing something? You’ve got many effect like distortion, overdrive, delay or something programed effect. You’re sure something is missing from your music and it’s not other than fatty and lively sounding.

Fortunately there is a solution for this. It’s a very interesting device.
It’s Aural Exciter or “harmonic enrichment”. This circuit adds harmonics sounds for the incoming signal.
Aphex Electronics company made the first device in the 70’s.
Initially it was made with vacuum tubes later with transistor. Nowadays you can get it as a software.

How does Aural Exciter work?

The incoming frequency multiplied by circuit. Well, if the incoming frequency signal is 2 kHZ than the circuit generate it to 4, 6, 8, 10, 12, 14, 16 kHZ frequency.

Here you can find the circuit of Aural Exciter or Harmonic Enrichment. Furthermore you can read interestin' things about this fantastic effect.
Exciter circuit
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Hybrid Germanium Fuzz

Published 15/05/2016 by H&G Amplifiers

You know the fuzz sound, but something is missing from it? Well, if something new or slightly different experience, these circuits can produce an alternative sound. This Hybrid Germanium Fuzz. Why Hybrid? It is combined with the old and new types of transistors. As the old germanium (AC128) in the current one (2N3904) are made of silicon. So meet old and new technologies. The whole circuit is based on the old familiar fuzz circuit. These do not have to change much. But what if before the fuzz, coupled with a preamplifier? For example:

Hybrid Germanium fuzz basic circuit. Use NOS germanium transistors.
Basic circuit

So, a pretty extreme sounds, or get extra distortion. Practically four parts and stronger, rougher sound is obtained. This small preamp, an existing Fuzz pedal built into it, such as tuning or mod. The options are:

Noise: Eliminate the high frequencies, less wheezing sound.
Volume: Output level
Fuzz: The amount of distortion
Compression: Stronger or softer fuzz effect
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Peppermill guitar overdrive

Published 12/02/2016 by H&G Amplifiers

We like to test the effects of different circuits, in addition to its own development. So we found a simple, few parts built in guitar Overdrive circuit. The first stage is a 2N7000 or BS170 MOSFET, J201 JFET the second circuit. The J201 Drain voltage is 4.5V. The R9 potentiometer to adjust. Variations may be a little higher voltage softer, low voltage rought the voice.

Peppermill guitar overdrive schematic. Remind one driven guitar amp. With J201 JFET and 2N7000 MOSFET.
Peppermill guitar overdrive

Some portions of the circuit is different from the original. Example C1, C2, C3 capacitor value. But that does not noticeably affect the sound.

For more information, please visit the original site:

http://www.runoffgroove.com/peppermill.html

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Muff Booster test

Published 16/01/2016 by H&G Amplifiers

The simple Muff Booster. This is a very simple circuit distorting project. Surely many people familiar with the legendary Electro Harminix from Big Muff guitar pedal. Many famous guitarists among almost as standard tools. this circuit, only a part of the original. One distortion segment. The electronic parts type of not sensitive, feel free to experiment with different types transistors and diodes, so a little bit different sound can be produced.

The diodes and transistor should be placed in a socket to be easily and quickly replaced. We tried out the following components: 2N2222, 2N5088, 2N3904, 2N2222, BC108 transistors and 1N914, 1N4148, red LED, 1N34 germanium diodes. The diodes to number want change , symmetrical, asymmetrical way to connect.

The EHX Big Muff segment circuit. Muff Booster guitar distortion.
The Muff Booster circuit

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Guitar Noise Gate

Published 20/12/2015 by H&G Amplifiers

While playing the guitar many times there is a problem that unwanted noise can appear. Hence the need for a guitar noise gate.  It happened specifically to a high-gain circuit is very sensitive to the surrounding radio signal.

Guitar noise gate circuit
Noise gate schematic
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PT2399 Basic delay

Published 27/11/2015 by H&G Amplifiers

The well-known and used PT2399 effect chip. Sometimes it needs a basic echo effect in music. But especially on stage, concert essential supplies an echo pedal.  Here is a simple basic circuit is shown.

Easy pt2399 circuit. Basic guitar delay effect circuit. DIY guitar pedal version.
Basic guitar delay schematic

The circuit at Princeton Technology Corp. manufactures. Inexpensive, it can be used in many places.

Datapage

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High voltage DC to DC converter

Published 25/11/2015 by H&G Amplifiers

This is a simple 555-based high voltage inverter circuit. The high voltage DC to DC converter is suitable for small current (a few mA) but requiring high voltage electronics. For example Nixiu display, VFD, or a other vacuum tube circuit. We will use a tube guitar pre-amplifier.

High voltage dc to dc converter, NE555 timer ic and IRF740 mosfet based circuit.
HV DC DC converter circuit

The C3 capacitor high voltage type! Min 250V.

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DC to DC converter

Published 14/11/2015 by H&G Amplifiers

This circuit is the old and well-known NE555 integrated circuits based. DC to DC circuit is not complicated, little parts, and doing pretty much stable voltage. It produces with the 12V DC voltage of 30V to voltage. The NE555 constant operating frequency is set. The 3 pin voltage convert of 30V. D1- D4 and C1-C5 voltage tripler circuit.  DC to DC converter is use in similar tube circuit.

DC to DC converter schematic, used 555 ic.
DC to Dc converter schematic
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Op amp inverting amplifier

Published 19/10/2015 by H&G Amplifiers

This is an inverting op amp circuit. Proven operating op amp circuit that uses the old and popular LM741 (at Texas Instruments products, datapage ) circuit.  Op amp inverting amplifier circuit is very simple, some spare part.

Op amp inverting amplifier
Op amp inverting amplifier

The prototype circuit:

Op amp inverting amplifier
Op amp inverting amplifier prototype circuit
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3 Transistor Fuzz

Published 10/10/2015 by H&G Amplifiers

Three transistor fuzz effect, strong sounding. Based on the famous Fuzz Face circuit, supplement with a preamplifier. Tried operating circuit!

fuzz guitar pedal effect
3 Transistor Fuzz guitar effect

Q1 2N5088 pre-amplifier transistor can be replaced 2N2222, 2N3904, BC547 type. If you need tougher sound, the Germanium Fuzz Face for you.

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The operational amplifier

Published 05/10/2015 by H&G Amplifiers

 

The operational amplifiers built a few dozen transistors attached to direct amplification circuits with high voltage. Often referred to as “op-amp”. Their properties vary widely depending on the model. Balanced inputs and outputs are usually asymmetric, high input resistance and very low output resistance. One of them is typical linearity and low cut-off frequency.

According to their structure can be constructed of discrete components or integrated circuits. The operational amplifier are historical reasons for designation, since this type of circuit during WWII analog computer developed.

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