This circuit was found in a Popular Electronics from the 90's. The transistors are general-purpose types and the loaded load depends on the voltage and must have a maximum current of 100 mA.
This circuit was obtained in Linear Technology documentation from 1993. The circuit provides 3.3 V and...
This circuit is from the National Semiconductor CMOS manual of 1977. What this circuit does is to...
This circuit operates from 25 to 65 kHz depending on the transducer used and the settings. We...