This circuit indicates when a rain is acidic by monitoring its pH. The circuit is from a 90s RE Experimenter Handbook. Some components used can be difficult to obtain today.
We found this circuit in the March 1976 Radio Electronics magazine. The circuit is very...
This high impedance step suggested by an English publication can operate up to 1 MHz with 1 V rms...
This circuit found in an American documentation from 1964, alters the duration of a pulse and can...