The Red Section
The red section is the main input stage of the alternating current (AC) power and conversion to provide direct current (DC) power. In the circuit the following components have been implemented; switch SW5, Meter light, a center-tapped transformer, and a full wave bridge rectifier B350C1000. The power switch SW5 either powers on or off the circuit. The meter light is an indicator that illuminates when the circuit is powered. The center-tapped transformer, on the other hand, steps down the incoming AC voltage to the desired lower value of AC voltage. Finally, the stepped down AC voltage is then rectified to DC voltage using the full wave bridge rectifier (B350C1000).
The Purple Section
The purple section is the smoothing section of the rippled full-wave DC voltage. It is composed of eight polarized electrolytic capacitors that are rated at 35V, 1000 microfarads and 35V 22 microfarads. The capacitors' main function is to smooth the ripple produced after the rectification the positive and negative AC half-waves. As such, they maintain a relatively linear DC component of the resultant DC voltage.
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The Yellow Section
The yellow section consists of various isolated components that either condition the signal, regulated power or indicates. Some of the components in the section include an internally compensated low noise operational amplifier NE 5532, operational amplifier TL074, voltage regulators 78L12 and 7915, and a light emitting diode. The NE5532 is used as a signal conditioner to convert current-to-voltage. The TL074, on the other hand, is also a signal conditioner for logarithmic amplification and inversion of the signal. The voltage regulator 78L12 take in the rectified DC voltage and produces regulated +12 volts while the 7915 takes in the regulated DC voltage and provides a regulated -15 volts. Finally, the light emoting diode illuminates to indicate the 12V supply is present; it can also be interpreted as the circuit is on although it does not show the status of +15, -12 and -15 Volts in the circuit.
The Green Section
The green section is a current-to-voltage converter. The circuit utilizes an internally compensated low noise operational amplifier NE 5532 to convert the passive current from the output of the voltage-controlled amplifier DBX202. The conversion is achieved by grounding the positive OP-Amp input terminal (pin 3) through a 470-ohm resistor and feeding the input signal through the negative input terminal (pin 2). The converter uses a 15-Kilo ohm resistor for feedback to the negative input terminal. It is also powered by + 15 Volts at (pin 8) and -15 volts at (pin 4). The -15 volts power source is grounded through a 100 nanofarads non-polarized capacitor to filter out noise.
The Orange Section
The orange section is the regulated DC voltages output tap-off points. The section consists of four different voltage potentials. They include +12 volts for side chain, + 15 volts for audio, -15 volts for audio and -12 volts for side chain. The voltages serve the need of the components in the circuit.
