We found this circuit in the June 1991 issue of Radio Electronics magazine. The integrated circuit is still available. The table gives the component values.
This circuit was found in a Raytheon transistor manual from the 1960s. The transistor is...
This circuit, published in 1978, has an interesting function. In the 2 V test position, the...
The transistors of this filter found in a 1993 publication can be BF245 or MPF102. The filter...