This is the power step of the previous circuit. Output transistors must be mounted on good heat sinks. The circuit is from documentation from the 60s.
Short pulses can be found in this 90's EDN circuit. The load is 50 ohms and the transistors are from that...
The simple optical intercom we show is from a 1995 documentation. The LEDs can be infrared or...
This circuit is from a 1982 publication. How about waking up to the first rays of sunlight? No,...