1. All resistors are 1% precision metal film resistors， Philip s CBB capacitor polarity， output coupling choose Import Weimaraner 1uF;
2. four 1N4007 diode rectifier， faster than the rectifier bridge， and more used in the current small occasions， each diode in parallel with a 104 CBB capacitor， effectively filter out high frequency noise introduced by the power transformer， the power cleaner， which Small signals mixing board is very important.
3. for the two power supply filter capacitor ELNA 2200uF/25V op amp power supply with voltage regulator 7815 and 7915， more clean stable power supply， voltage higher than 7812 and 7912， enabling the op amp in a better state ( such as amplitude， etc. bigger)， 7812/7912 regulated mixing board mostly for power supply filtering capacitor selection voltage 16V reduce costs.
4.Operating Voltage :12-18V， recommended dual 15V transformer 10 watts or so to
5.PCB Size: 58MM * 120MM * 1.6MM (width x length x thickness)
Original 4 NE5532 (two for left and right channel audio amplification process， the other two components for 4th order low-pass filter subwoofer output frequency is adjustable from 50Hz-150Hz)， potentiometer adjustment from left to right are: bass frequencies; bass; left and right channel treble; around bass; around the total volume; overall total volume (six potentiometer center spacing 20MM).
Product pictures:
a list of components required for Mixing board
PCB board Component has a screen printing
AC power input terminals: AC GND AC select 12-18V AC voltage.
The left terminal as an output(Sub GND R L)， right terminal as input (L R)
The purpose of each potentiometer， and the distance between others
the amp ic is ne5532，if firends want to update can change others，like OPA2604AP， our store also selling.
size is small preamp circuit is good，suitable to installed for machine
The Installation image for reference
Circuit design for reference
Friends interested in the reference circuit for learning and communication!
