Second Order Unity Gain Filter (CB25817E)

Using a 741 op-amp this circuit high-pass to 10 kHz was found in the February 1995 issue of Electronics Now magazine. The power supply must be dual.

1 mA Constant current sourcer (CB1197E)
The transistor of this constant current source may be the BC548 or equivalent. Resistor R2 may be...
Operational Bistable (CB5429E)
We found this circuit in a manual from the 80's. The circuit is valid for any operation and the...
TBC8x7 Bipolar Junction Transistors (COM159E)
November 2016 - TBC8x7 Series Bipolar Transistors with 60 V Vcbo and 150 mA Collector Currents can now...