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Opamp Tester
For Audio and Other Applications
The available range of operational amplifiers is extremely diverse. Usually, the initial selection for a specific purpose is based on technical specifications — for example, on the websites of semiconductor distributors. If several candidates then remain on the shortlist, you may have to carry out further measurements yourself, as it is not always possible to ascertain all the relevant parameters under the planned operating conditions from data sheets. This is exactly what the tester presented here is for.
Component list
Component List
Resistors
1% metal film, wired
R1, R6, R11, R15 = 10 kΩ
R2, R5, R7, R10, R14, R18 = 4k7
R3 = omitted*
R4, R12, R13 = 3k3
R8 = 1k1
R9, R17 = 10 kΩ
R16 = 1 kΩ
Capacitors
C1…C4 = 100 nF, film, pitch 2/10″
C5, C6 = 22 µF /25 V, electrolytic, pitch 1/10″
Semiconductors
IC1, IC2 = TL072, dual opamp*
Miscellaneous
4× IC sockets, 8-pin, machined
JP1, JP2, JP4, JP5, JP7, JP8, JP10, JP11 = 2-pin header, pitch 1/10″
JP3, JP6, JP9, JP12 = 4-pin header, pitch 1/10″
JP13 = 3-pin header, pitch 1/10″
Suitable 4-pin socket connectors for loads*
Circuit board 230210-01*
* See text
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