This circuit was found in Siliconix documentation from the 1980s. Equivalent operational amplifiers can be used and the output current is very low.
This circuit incorporates the passive control of the previous circuit and was also found in the...
I found this circuit on a December 1976 Radio Elettronica. The Italian magazine no longer exists, but...
This circuit is like the previous one except that it can be triggered electronically. The circuit is...