The indicated circuit uses an unusual buffer from National Semiconductor. The frequency is given by resistors R1 and R2 as well as capacitors C1 and C2.
May 2017 - Panasonic's new APS1 series of optical couplers with 3 750 V insulation and up to 50...
The transmitter we have described, operates at a frequency between 88 and 98 MHz, with a range of the...
This circuit is from an American transistor book from the 60's. The transistor is germanium of the...