This two-port configuration of the 4001 was found in the April 1988 issue of Radio Electronics magazine. The timings are given by R1 and C1 as a function of the desired behavior of the circuit.
This setting is valid for other transconductance operational amplifiers. The circuit is from...
With this name the LED effects circuit presented was found in the Electronics Now magazine of...
January 2017 - Texas Instruments' new TLVx172 operational amplifiers with Rail-to-Rail outputs can now be...