Description

This is a replacement part for one of the world’s first consumer video recorders, the Akai VT-100 and VT-110. These units used an early form of IC to implement SR NAND latches for use in the servo and sync circuits. These parts, marked FF-10, are quite prone to failure and were completely impossible to find replacements for. That is, until now! These modern FF-10s are my reimplementation of the original circuit (as printed in the service manual) using discrete surface-mount components.

The replacement part is exactly the same form-factor as the original except thinner. Thus, it will work as a drop-in replacement as-is or the ambitious buyer can ‘re-stuff’ it into the plastic case of the original part for a 100% authentic look.

For more information on the design of the part please read my blog post here.

Even if you don’t own a VT-100 or VT-100 this part is an absolutely text-book example of SR NAND latch implementation and so may be useful for educational / hobby projects of other sorts. See the schematic in the pictures.

The pinout for this device is, from left to right, R, Q!, Vcc, Q, S, Vee and the truth table is below

SR Action
0 0 Illegal State
01 Q=1, Q!=0
10 Q=0, Q!=1
11 Retain State

Download the schematic and PCB layout for this product here. Note that these files are available for PERSONAL, NON-COMMERCIAL USE ONLY. In short, you are welcome to use them to build this product yourself, but you must contact me to work out a commission if you wish to sell anything derived from them. This product was designed in ExpressPCB so you will need to download a copy of that software from expresspcb.com before you can view the files.