This circuit uses a capacitor that depends on the frequency of the crystal. We found it in a 1967 documentation. The maximum frequency is around 100 kHz.
This circuit was found in a Linear Technology manual from the 1990s. The circuit makes use of the...
This battery-powered micropower supply was shown in Radio Electronics magazine in 1991. The...
This circuit can measure voltages from 0 to 10 V with a very high input resistance. The circuit is...