Melody generator (CB9207E)

Found in an Elektor from the 90s, this circuit is based on components that are still common today. Power is supplied with only two batteries.

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Level Indicator 8 x 1 (CB16873E)
This level matrix display was found in a 1994 documentation, but it can still be assembled, as the...
Parallel Amplifiers (CB8944E)
This configuration for proper connection of parallel amplifiers was found in National...
Variable Temperature Thermostat (CB19957E)
The sensor used in this circuit is uncommon today, however equivalent types can be tried. The...