Found in a 1988s Radio Electronics, this circuit uses transistors of general use to increase the intensity of signals up to about 30 MHz. The power can be done by battery because the consumption is low.
The circuit shown in figure 1 uses the ST8R00 from ST Microelectronics which consists of a 1 A...
This is the conventional application of a 1 out of 10 decoder with CMOS 4017, as shown in an old...
We found this third-order Butterworth asymmetric filter in an old manufacturer documentation. The...