Archive for May, 2008
Portable NiCd battery charger
The portable batteries charger has been designed to provide an opportunity to load NiCd batteries even in the outdoors from a 12 V battery of a vehicle. When the circuit is connected to the vehicle battery, D2 lights only if NiCd battery was connected with the correct polarity. Since even on the discarded batteries [...]
Audio amplifiers from class A to T
The final amplifier is the power source of every audio installation. Its job is to convert a small alternating voltage into a powerful signal for driving loudspeakers with as little distortion as possible.
Delivering a large amount of power is not a simple task for an amplifier. Voltage amplification and current amplification are both necessary in [...]
VOX circuit schematic
VOX is a switch ordered by voice, often used at microphones instead of the classic switch button. The vox described here may be connected to almost any type of audio equipment which has an external speaker for coupling.
The threshold action is set with volume potentiometer of the audio amplifier which commands the [...]
