Found in American documentation from the 1990s, this simple circuit excites a LASER diode. The integrated circuit is from Sharp, uncommon nowadays.
This is a combined circuit of tone generator and preamplifier. We found it in a 1975...
We found this simple alarm circuit in a 1986 documentation. The circuit uses sensors of the NA...
We found this circuit in the Linear Applications Handbook by National Semiconductor. The base is...