We found this circuit in a 70s Electronic Design documentation. The circuit uses general-purpose transistors from the time. Linearity is better than 0.25%.
Found in Radio Electronics this circuit uses a fotodiac to drive a triac. The circuit can use...
Found in an Electronic Design from 1965, this circuit makes use of transistors of the time. The...
This simulated circuit on the NI Multisim transmits modulated infrared signals with the audio...