Time Manipulator Circuit

This is a design circuit for a type guitar effect. This circuit can be used as delay, reverb or echo because this circuit is use time manipulator. It uses two PT2399 delay integrated circuits to archive up to 600ms delay. Also, with the help of 4 analog switches, the internal configuration of the pedal can change: placing the PT2399 delay chips in series or parallel and adding extra features. This is the figure of the circuit;

Spring Reverb Schematic Circuit

This is design for guitar reverb. Spring reverb units are most commonly used in guitar amps, having been replaced by digital effects in most other areas.  The circuitry will always be somewhat experimental, and may change quite dramatically depending on the type of spring reverb unit you can actually get your hands on.  The PCB is designed (available soon) to accommodate most reverb tanks, with the optimum being those with a low impedance drive coil. This is the figure of the complete schematic diagram of the Spring Reverb circuit.

Since the P113 headphone amp is very easily modified for constant current drive, this used to be recommended because it works very well.  However, wiring the two halves of the P113 board differently is somewhat clumsy, and while it works well it’s not ideal.  The circuit shown here uses the same drive system, and has everything else that's needed for a complete reverb system.  The circuit shown in Figure 2 is the latest incarnation of the reverb circuit.  Unlike the others that are somewhat 'piecemeal', it's a complete reverb sub-system. 

Guitar and Bass Compressor

This is a simple guitar and bass compressor. It's only possible because of the performance of the NE5532 opamp, which can drive the low impedance of the rectifier without any sign of distortion.  VR1 controls the limiting threshold, and the output level from U1B is set at about 3V RMS (sinewave) or ±6V peak with programme material.  The gain of the first stage can be increased if needed, by reducing the value of R4.

Guitar Sustain Circuit

There is alternate for the design of the Guitar Sustain. This version is designed specifically for operation from ±15V supplies (±12V supplies can also be used with no changes).  This version can be used as a full range limiter for music, and might typically be applied in an amp rack to prevent amps from being overdriven (and distorting).  While the Figure 1 version can also be used, it is less convenient because of the single supply, and the rectifier is not quite as good as the unit shown here. This is the figure of the circuit.

Guitar And Bass Sustain Circuit

If you are guitar player or want to have wonderful sound of a guitar, where the note just hangs there seemingly forever, you need a sustain booster for your guitar audio outputs. Sustain can be obtained by turning the amp up full, but the rest of the band will just kill you - they need to be able to hear themselves too! This little project is best used in the effects loop of a guitar amp (if it has one - not all do).  It can be used direct from the guitar, but the effect is not as good, since it is designed for relatively high levels (around 1 Volt). Here is a design for guitar and bass sustain schematic diagram. This is the figure of the circuit.

Tips for Increasing Bass Sound for Car System Sounds

To improve the quality of the car's sound system is to replace standard audio devices. The speaker is the audio device that is most often replaced, the reason for the user is because the sound quality standard speakers are not maximal. In addition to the poor sound quality, if the music volume is loud the speaker sound is not strong enough. 

Let's look at this article how the Power Amplifier & Subwoofer makes the power more maximal The second reason is because replacing speakers is more practical and installation is faster. The market can easily be bought at a fairly affordable price. But do not just buy speakers if you do not understand the specifications of the speaker, not even better, the results of the sound that is not in line with expectations. 

Binaural Synthesizer/Mono to Stereo Converter Small Speaker/Phones Circuit

This is simple circuit can be used to drive two high-impedance loudspeakers or stereo phones, taking monophonic input (one channel), to produce a stereo signal which spread along the midway between loudspeakers when the input signal contain many frequency components. This is the figure of the circuit;

This circuit has two channels, left and right, right channel has high-pass active filter and left channel has low-pass active filter with cut off 750Hz. This circuit is designed for low to high-impedance speaker or phones. In the schematic diagram below, you can see the output is passed through a series resistor. Without this resistor, uncontrolled oscillation might occur on the output channel when low impedance 8-ohm loudspeakers or phones are connected to the outputs directly. Op amps will drive 8-ohm loads with low volume levels, but give ample volume with 2000-ohm phones, so the higher the impedance the higher the power.

Negative Booster Regulator

This is a circuit for the variation on the buck-boost topology is the negative boost configuration. This circuit is based on LM2575-12. This is the figure of the circuit.


The circuit accepts an input voltage ranging from −5V to −12V and provides a regulated −12V output. Input voltages greater than −12V will cause the output to rise above −12V, but will not damage the regulator. Because of the boosting function of this type of regulator, the switch current is relatively high, especially at low input voltages. Output load current limitations are a result of the maximum current rating of the switch. Also, boost regulators can not provide current limiting load protection in the event of a shorted load, so some other means (such as a fuse) may be necessary. [Circuit’s source: National Semiconductor Notes].

Inverting Buck Boost Circuit Using LM2575

This is a design circuit for inverter circuit. The circuit is built by LM2575. This is the figure of the circuit.


LM2575-12 in a buck-boost configuration to generate a negative 12V output from a positive input voltage. This circuit bootstraps the regulator's ground pin to the negative output voltage, then by grounding the feedback pin, the regulator senses the inverted output voltage and regulates it to −12V. For an input voltage of 12V or more, the maximum available output current in this configuration is approximately 0.35A. At lighter loads, the minimum input voltage required drops to approximately 4.7V. The switch currents in this buck-boost configuration are higher than in the standard buck-mode design, thus lowering the available output current. Also, the start-up input current of the buck-boost converter is higher than the standard buck-mode regulator, and this may overload an input power source with a current limit less than 1.5A. [Circuit’s source: National Semiconductor Notes].

AM-FM Antenna Booster Circuit

This is design for antenna booster circuit. This circuit can be used to amplify the weak signal received by the antenna. This circuit is a simplest form of circuit. Antenna for AM/FM is usually not tuned for the optimal dimension of 1/4 wavelength, since we prefer small portable size. This is the figure of the circuit.


Use around 470uH coil for L1 if you use for AM frequency (700 KHz - 1.5 MHz) and use around 20uH for SW or FM receiver. For short wave performance, using this antenna booster, you’ll get a strong signal as we get from a 20-30 feet antenna, with only a standard 18″ telescopic antenna and this booster circuit. The power supply should be bypassed by a 47nF capacitor to ground, at a point that should be chosen as close as possible to L1.

Transformer Voltage Booster Circuit: DC-DC Step-Up Switching Regulator Using Transistors

A DC-to-DC step-up converter is traditionally implemented using transformer, working by converting the DC voltage to AC Voltage, step-up it using transformer, then rectify and filter the transformer’s output to get a higher DC voltage. Using a switching method, we can step-up a voltage without a transformer. We just need an inductor which is driven by a switching transistor to boost the voltage. This is the figure of the circuit.


The most interesting this is that circuits use a discrete component: no integrated chip is required, only few transistors with few passive components. Because the switching topology is a boost converter, this circuit cannot be operated as step-down regulator, so the output will always be higher than the input. The voltage output is depend on the load because the feedback mechanism, through the zener diode, will maintain the output at about 14 volt, regardless the voltage input variation and load current variation. The current from the voltage divider will flow through the zener diode if the output goes higher than the nominal value, and this condition will stop the oscillator built around the 2N3904 transistors. Stopping the oscillator will drop the output voltage and thus maintain the required voltage level at the output. This transistor (Q1, Q2, and Q3) form a Schmidt trigger that drive the final transistor Q4 (the switching transistor 2N3053).

This circuit is suitable for battery booster, if you need to run your 12 volt equipments on your old car that is provide only a 6V supply from the battery. The output of this voltage double can be adjusted by changing the voltage divider, or for easier adjustment, you can replace the 4,7K resistor with a 5K potentiometer. Using a good inductor (low resistance), you can achieve up to 80% efficiency, and up to 2 Watt power can be delivered to the load. [Circuit's schematic diagram source: Bill Bowden's circuit collection]

5V to 12V Boost Converter Using LT1370

This is a design for booster converter. This booster can convert the voltage from 5 V to 12 V. This circuit is using LT1370 IC as main control. The high 6A switch rating permits the circuit to deliver up to 24W. This is the figure of the circuit.


The inductor needs to be chosen carefully to meet peak current values. The output capacitor can see high ripple currents often, as in this application, higher than the ripple rating of a single capacitor. This requires the use of two surfaces mount tantalums in parallel; both capacitors should be of the same value and manufacturer. The input capacitor does not have to endure such high ripple currents and a single capacitor will normally suffice. The catch diode, D1, must be rated for the output voltage and average output current. The compensation capacitor, C2, normally forms a pole in the 2Hz to 20Hz range, with a series resistor, R3, to add a zero at 1kHz to 5kHz. The S/S pin in this example is driven by a logical on/off signal, a low input forcing the LT1370 into its 12mA shutdown mode.

Boosting Regulator Current Circuit

This is design of a pass transistor used to increase the current output of a voltage regulator IC. The circuit is design by Andy Collinson. This circuit is control by regulator IC. The IC that using in the circuit is 78xx series. This is the figure of the circuit.


The operation of the circuit is description by a power transistor is used to supply extra current to the load the regulator, maintaining a constant voltage. The currents up to 650mA will flow through the regulator, above this value and the power transistor will start to conduct, supplying the extra current to the load. This should be on an adequate heat sink as it is likely to get rather hot. Suppose you use a 12v regulator, 7812.

The input voltage should be a few volts higher to allow for voltage drops. Assume 20 volts. Lets also assume that the load will draw 5amps. The power dissipation in the transistor will be Vce x Ic or (20-12)x8=40watt. It may keep you warm in the winter, but you will need a large heat sink with good thermal dissipation. If you want to increase the output current with a negative regulator, such as the 79xx IC series, then the circuit is similar, but an NPN type power transistor is used instead.