This amplifier with the LM1098 and LM101 by Motorola from a 1990 manual can be designed with more modern operations. The bandpass for small signals is 3.5 MHz and the power range is 250 kHz.
This alarm with the 555 integrated circuit is from an EDN from the 90s. The circuit directly...
Found in a General Electric documentation from the 1980s, this circuit makes use of a FET...
This circuit was suggested by Siliconix in a 1980s publication. The circuit uses components from the time...