This setting appears elsewhere in this section. This was obtained from Texas documentation from the 90s. The activation time is given by R1 and C1 and in this case it is in the order of a few minutes.
This circuit is from an English publication from 1976 but can be easily assembled with BC548...
Found in 90's Electronic Engineering this circuit can be used to measure phase angles between two...
This circuit is suitable for applications such as a TTL log digital link. Maximum frequency is...