This circuit is from an 80's publication. It makes use of small 6 V x 50 mA incandescent lamps. The diodes can be general purpose or even 1N4002. The transformer is 6.3 V with 100 mA or more current.
The frequency of the produced sound depends on the capacitor. With capacitors of known values, you can...
This circuit is from a 1982 publication. How about waking up to the first rays of sunlight? No,...
July 2017 - Microchip's new MCP39F511 demonstration and development boards, which consist of...