This circuit has a gain of 6 dB for low frequencies from 85 Hz and can be used in a mini subwoofer. The circuit is from a Radio Electronics from March 1990.
Found in a 1990s Popular Electronics, this circuit produces a tone on a small speaker. The keyer...
For low-frequency signals, this circuit transforms a single oscilloscope into a dual-trace. The...
To obtain a large brand / space ratio, for example, from 1 to 100, we can use the TLC7555 in the...