This circuit is from a 60's documentation. The capacitance C1 can be between 20 pF and 0.01 uF depending on the generated frequency. Equivalent transistors may be employed.
This shield can be used both to interface TTL circuits and microcontrollers. The resistor in...
Combining an Ultra-Low Power MCU with an 802.15.4 Radio, the SAM R30 Enables Long-Lasting Battery...
This small circuit for the medium or short-wave range, depending on the coil, was found in a...