This TTL shield with high level logic is from the LM111's own 80's manual. The integrated circuit is no longer easily found, but the circuit can be adapted to use modern equivalent operational amplifiers.
We found this circuit in the semiconductor ON manual using couplers of the time. These components...
VU or Volume Units is a sound intensity indicator that can be installed on any stereo. The...
This circuit was originally designed for medical applications and biological experiments. The...