Ramp generator with the 555 (CB7598E)

We found this circuit on an Elektor from the 90s. The frequency is given by capacitor C1. The circuit oscillates at 0.1 Hz and is used as an astable.

Remote Control Extender (CB25916E)
This circuit was found in a Radio Electronics issue from May 1989. Please note that it may not...
Water Alarm (CB4368E)
We found this circuit in an English magazine from 1976. The magazine no longer exists, but just...
OPAx196 Texas Instruments Power Operational Amplifiers
Texas Instruments' low power operational amplifiers OPAx196 can be found on Mouser Electronics....