Universal Chip Preamp
Wrote
by Zang(digi01)
2009.06.30
Introduction
The universal chip preamp (for short : UCP) is a chip based audio preamp.the design goal is below:
1,simple configuration,the standard version will use 2pcs universal dual opamp and few resistors.
2,dc coupling,there are no capacitors in the signal route.high(low)-pass filtering network for unstable opamp.
3,diy friendly,the project will be completed with pcb board,I am trying to make the pcb compact,easy install,easy embed,easy tweaking.
Project schematic
UCPv1 standard is the determined version basis on 2 pieces of universal dual opamp.Full discuss at here.
-UCPv1 standard schematic
-Test power supply for UCP
PCB layout
-UCPv1smt PCB layout
-UCPv1smt assembled module top view
-UCPv1smt assembled module bottom view
The first round UCPv1smt pcb is available.the below buy now button is for 2PCBs order include shipping cost.I
ship to international.
The board will come with all smt resistors and I can pre-solder the smt parts for buyer.
Assemble tips
1,the Ci set up for avoid input dc offset,it will work with some bjt input opamp.Ci can be bypassed as usual.
2,the 200p Cb set up for high frequency roll off.
3,R7,R8 is feedback resistors on the pcb bottom.
4,the LED on the positive rail of power supply.limite resistor Rled on the pcb bottom.
5,PCB connections of standard unbalanced stereo and Parallel.
6,The volume potentiometer can be set up before the UCP or after the UCP,liner 10K is a
decent value.
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In Progress
Improve version UCPv2 will use 2pcs universal single opamp with LME49600 buffer ouput.
-UCPv0.2 schematic
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