Skip to content

Category: Electronics

CD2399

Today’s interesting is the CD2399GP chip. A copy of the popular PT2399 effects processor. Here is a fact datasheet in Chinese.

CD2399GP
CD2399 Sound Processor
Leave a Comment

Tube amplifier electronics repair

Some pictures: electronics repair. The product name: Dynacord Eminent II. This is beginning to be manufactured in the mid sixties. Initially, all tube design, and later the transistor preamp and tone section. Meanwhile, little change in design as well. This four different input and tone control. A small band certainly met at that time.Well, let’s look at what is inside.

Dynacord Eminent II
Dynacord Eminent II

Let’s look at it:

Leave a Comment

Aural Exciter Makes Your Sounding Real

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

Leave a Comment

Simple distortion effect with TL072

You need a new and simple Distortion effect? Really Simple? Look at this circuit:

Simple distortion effect circuit, few parts, real guitar distortion sound.
The simple distortion efect circuit.

Not too demanding parts. But the voice .. hmm. Indeed, only a few spare parts required. The circuit is the “soul” of the tl072 chip. It is built around the circuit. And, of course, add garnish. Well, actually distort the character of the D1 – D4 diodes is given. In this case, two 1N4148 and two 1n914 diode. cut the signal. This results in a symmetrical but powerful cut. or maybe the solution according to their own ideas, but you can choose a sound character. even the parts is not too critical. I recommend them to feel free to experiment. Perhaps trying a different opamp is that it leads to what sound will surely hear some variation. the completed circuit can also change your tone of options. Examples: tone controls

Leave a Comment

LM386 Overdrive Effect

LM386 overdrive: easy, cheap, and fast to make. This is known and popular audio amplifier circuit with a fairly simple but good sounding overdrive guitar effect. Neither the operation of the complex.

LM386 Overdrive Guitar Effect
LM386 Based overdrive guitar effect

BS170 mosfet guitar signal to the already worsened. the R8 potentiometer regulates the amount of signal to the 386. If you have more than that the chip can handle, then the signal will be distorted. That is, the overdrive. So it is quite dry and rough sound. And of course it’s good for us. Listen to:

Leave a Comment

Guitar Noise Gate

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

Leave a Comment

PT2399 Basic delay

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

Leave a Comment

High voltage DC to DC converter

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.

Leave a Comment

DC to DC converter

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

Leave a Comment

Op amp inverting amplifier

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

Leave a Comment