Chinese "Classic 47" Variant     2021/10/19
Ami Sapphire

Last Updated: 2022/04/10


2021

[1102]
Identified capacitor C1 as a TDK Electronics film cap, 5% tolerance.
Identified potentiometer RP1 as a Bourns PTD90-like pot, 50Ohms. Added note.


2022

[0331]
Potentiometer RP1 is 50KOhms and NOT 50Ohms. This is an oversight and it is
changed.

[0410]
Resistor wattage changed from 0.5W to 0.25W.
Resistor names are added to the values list. This was a long oversight.



Product name: 47-PB0 DA1
PCB name: OPAMP-PRO
PCB design: L0094

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Bill of Materials


Capacitors
Note: Cap brands are listed here for historical note only.

Electrolytic
CD1, CD4, CD5, CD8 - 47uf 25V [Elna RE3] - Quantity: 4
CD2, CD3, CD6, CD7 - 47uf 63V [Panasonic FC] - Quantity: 4
CD9 - 220uf 35V [Nippon Chemicon LXZ] - Quantity: 1

Film
C1 - 100nf 100V [EPCOS- TDK Electronics B32529] - Quantity: 1


Resistors
Note: All resistors are metal film type at 1% tolerance, rated at 0.25W.

RE8, RE10 - 2K - Quantity: 2
RE7, RE9, RE13 - 10K - Quantity: 3
RE1, RE2, RE3, RE4, RE5, RE6 - 22K - Quantity: 6
RE11, RE12 - 100K - Quantity: 2


ICs
IC1, IC2 - LM358, NE5532, TL072, TLE2072 - Quantity: 2


Misc
IC1, IC2 - 8-Pin Sockets - Quantity: 2
GND, VCC - Power Tap, 2-pin - Quantity: 1
PHONE1, PHONE2 - 3.5mm Phono Jacks - Quantity: 2
RP1 - Potentiometer [Bourns PTD90-like], 50KOhm - Quantity: 1
LED1 - LED, 3mm to 5mm - Quantity: 1
GND (right edge) - wire shield to ground/earth


Notes
RP1 is based on the Bourns PTD90 series 2-ganged potentiometer on the original
PCB. If the build is used for another design, any 50K ohm, dual-ganged linear
potentiometer can be used.