A friend asked me for a guitar pedal problem. He said that he used a few guitar effect pedals, but it works well. And the wiring is very messy on the stage, asking if there is a solution. Here is a simple solution.
A small box is mounted behind the amplifier that supplies the 9V power to the effect pedal, and the amplifier receives 9V power through the effect pedal switch. The power output and guitar signal input lines are combined into a single cable using the multiple cable connection points shown below.
The circuit below can be divided into two parts:
Power supply and signal processing. The power supply portion is composed of a transformer X1, voltage regulator chips 7805 and 7905, D1 to D4 rectifier bridges, and a small number of discrete components. The signal processing circuit consists of two op amps Nl and N2.
The 9V power supply to the effect pedal comes from the step-down transformer X1. MOV1 is a metal oxide varistor that absorbs any large spikes in the AC power supply.
The chip 7905 is a low-power -5V regulator with a 3.9V Zener diode ZD1 connected to its ground. This allows a total of -8.9V to be output with the -5V of the 7905 itself. The same consideration is given to designing the chip 7805 regulator, but it is a +5V regulator, plus +3.9V to get +8.9V output.
Using a high-quality voltage regulator chip and adding a heat sink is enough for five effect pedals.
The higher the voltage drop across the regulator chip, the lower the potential of the output current. The resistors Rl and R2 provide a constant load to the power supply circuit to ensure proper regulation of the regulator. Capacitors C3 through c8 ensure that the power supply is as clean as possible. It is best to use a heat sink for the two regulator chips. Otherwise the chip will be hot, affecting its normal function.
Circuit operation: The input signal stage N1 uses a basic differential amplifier to receive the input signal. The voltage follower N2 is used to buffer the output signal and send it to the amplifier. N1 has two inputs. If the two input amplitudes are different, the difference between the two is amplified, and the amplification ratio is R4/R3 (R4=R6 and R3=R5 have been assumed). If the amplitudes of the two input signals are the same, the two signals are attenuated, and the attenuation amplitude is the common mode rejection ratio CMRR of the circuit.
The value of CMRR is determined by the selected op amp, the auxiliary components used, and the circuit topology. If a standard resistor is used, the component shown in the circuit is worth a full amplification factor of l.
R7 and C13 form a passive low-pass filter that continues to attenuate unwanted high-frequency components. The second op amp, N2, forms a simple voltage follower that provides very low output impedance to the load. Drive the standard amplifier.
The circuit can be mounted on a regular PCB and placed behind the amplifier. The unit must be made small and strong. Therefore, a strong pressed aluminum is used as the outer casing. To facilitate the loading of PCB components.
In order to ensure easy operation, only three connections to the circuit need to be connected:
One is the AC power from the transformer, the other is to connect 9V to the amplifier's lead, and the third is the guitar signal input to the 5-way connector of the effect pedal.
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