LOW-COST HEARING AID Schematic

Commercially available hearing aids are quite costly. Here is an inexpensive hearing aid circuit that uses just four transistors and a few p...

RANGKAIAN PENGUAT MICROPHONE

Microphone preamp schemeThis series uses low noise transistor types, namely BC 650 C, this transistor can be found hard degan replaced 109 B...

RANGKAIAN Mic Pre-amp PORTABLE

RANGKAIAN Mic Pre-amp PORTABLEMic Pre-amp PORTABLE scheme|rangkaian circuit consume low current supply (about 2mA), so will have a long batt...