This circuit was found in old documentation, however the components used are common today. The selection of times is done by switch and the 556 consists of a double 555.
We found this amplifier for automotive use in the Philips integrated circuit manual from 1990. The...
This interesting circuit records a few seconds of audio signals, reproducing them in a small...
Settings like this can be found at various points on this site. The trigger door can be a 4093...