The Noisy Cricket by BeavisAudioResearch is a 1/2W guitar amplifier based on JRC/LM386 chip. It is an evolution of the Ruby Amp by Runoffgroove, keeping the circuit core idea and introducing new features like a tone control and an overdrive boost switch.

The Ruby Amp is an LM386 based guitar amplifier. It is an enhanced version of the previous Little Gem Amp also designed by Runoffgroove. The main improvements of the Ruby Amp vs the Little Gem are new the input buffer, a renovated volume control, and an updated Gain potentiometer.

The Smokey Amp is maybe the smallest and most inexpensive guitar mini amplifier, it was made to fit in a cigarette pack and to be powered by a 9V battery.
It was designed by Bruce Zinky, an American Electronic Engineer who headed the Fender amplifier "custom shop". He developed the simple, clever concept of Smokey Amp in the early 80's and improved it for production in the 90's. There are two market models: one in a cigarette pack, and one in a clear molded polycarbonate box.

The Smokey Amp will also drive any 4, 8 or 16ohm speaker cabinet, including 4x12s, and can even be used on the input of another amp as a fuzz box or booster. There are no controls on the amp, just one input, and one output, meaning that everything is controlled by the guitar volume and tone knobs.