Bastl Instruments TIMBER Assembly Manual page 24

INSERTING ICs
Before the last soldering run, insert the ​ I Cs into the sockets (1x ​ T L072​ , 1x ​ T L074P​ ) . Again, watch out
for the ​ n otch​ ​ o rientation​ ! ​ ( for TL072 is relevant the dot on it)
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