Larken 2068 Disk Interface [schematic]

Filter capacitors

C3  between 00 & 74
C4  between 32 & 1770
C5  between 1770 & 7406, 7438
C6  between 174 & disk connector

Parts

component     marking     value

R1,R2,R3,R4   R-BK-BN     200Ω
R5,R6         BN-GY-R     1800Ω
R7,R8         BN-BK-R     1000Ω
R9,R10        Y-V-BN      470Ω
R'                        391 x 5 SIP

C1            102         .001µF
C2            471         .00047µF (470pF)
C3,C4,C5,C6   104         .1µF
C7                        22µF, 10v

diodes        1N4148

chips
WD1770*       74LS00       7406
74HCTLS32     7438         74LS74
74LS138       74HCTLS174   74LS366

16 Mhz crystal

* or WD1772 (used with L3f EPROM)