This circuit was found in documentation from the 1970s. However, it can be implemented with modern transistors such as 2N2222 for Q1 and BF494 for Q2. The crystal depends on the desired frequency.
This circuit was found in a Signetics documentation from the 1980s. The integrated is a PLL and...
This configuration makes use of an LM3900 transconductance operational amplifier. The transistor can...
This circuit uses a common diode as sensor. The output goes from 0 to 10 V with the temperature change in...