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An audio mixer kit with no schematic
K-Experiment:
I got an Audio mixer kit but there is no available schematic diagram so I need help in making my own audio mixer with the following parts:
2, 100 ohm resistor 1/4w
10, 1k ohm resistor 1/4w
2, 10K ohm resistor 1/4w
1, 1M ohm resistor 1/4w
4, IN4001 Diodes
1, Red 5mm LED
4, 0.1 uf (104) ceramic capacitors
2, 0.0002 uf (22) ceramic capacitors
2, 1000 uf 16v electrolytic capacitors
2, 100K ohm Potentiometer
6, 10K ohm Potentiometer
1, 250v 0.2a fuse
1, 250v spst switch
1, 220v to 9v 200a transformer (secondary is center tapped)
2, UA741cp op-Amp
(Mains Voltage is 220v 60Hz)(ps: there was no circuit board)
Zero999:
I can guess, but the old 741 isn't a very good op-amp for audio. It will work, but isn't ideal.
soldar:
--- Quote from: K-Experiment on May 24, 2019, 03:59:40 pm ---I got an Audio mixer kit but there is no available schematic diagram so I need help in making my own audio mixer with the following parts:
--- End quote ---
No PCB? No schematic? You bought this as an "audio mixer"? Because what you got is not an audio mixer at all. You just got a bunch of parts.
If you want an audio mixer you might as well start all over again. It will save you time and trouble.
magic:
Something like figure 4 here must have been intended.
I'm only puzzled by the choice of resistors, 1k seems low for the inputs and no other value is available in enough quantity.
Arjunan M R:
--- Quote from: Zero999 on May 24, 2019, 04:19:02 pm ---I can guess, but the old 741 isn't a very good op-amp for audio. It will work, but isn't ideal.
--- End quote ---
NE5534 will be a good solution.
Its a low noise opamp built for audio purposes.
Here is the datasheet http://www.ti.com/lit/ds/symlink/ne5534.pdf
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