This elaborate mixer is from an Electronics Today International from the 80s. Operational amplifiers are common and resistors with no value determine the gain of the amplification steps.
This circuit is from a 1978 optoelectronics manual from Texas Instruments. The transistor can be a...
This inverter can reach a power of 300 W depending on the transformer used. In this case, a...
This circuit uses an LM3900 transconductance operational amplifier to generate pulses whose...