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Bi-Directional MOSFET Voltage Level Converter 3.3V to 5V edit / delete
Neat circuit using a single MOSFET to do bidirectional level conversion. This is what the Sparkfun etc. boards do.
to electronics level-conversion logic microcontroller mosfet ... on 24 March 2013
LucidScience - LAZARUS-64 Electronics Projects, Plans, Schematics and Source Code. edit / delete
Discrete logic graphics card. This is very similar to the one I built for my Z80 machine -- but his does colour!
to electronics graphics logic retrocomputing ... on 02 May 2012
Open 7400 competition winners | Dangerous Prototypes edit / delete
Some fun entries -- including a couple of radios. No 4069UB-based power amplifiers, though!
to 4000 74 digital electronics logic ... on 02 May 2012
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tasty by Adam Sampson.