Simple Audio Booster

Simple Audio Booster
This Audio booster circuit is very simple and can be applied to fm tuner or audio pre amplifier. The 2N3392  is a low-noise type transistor in TO-92 case. The transistor can can be replaced by a NTE199 or ECG199. If you wish to use a TUN, cross reference the parameters with one of the units from this list : TUP-TUN (more…)

Simple Microphone Pre-amp

Simple Microphone Pre-amp
This Simple preamplifier circuit provides sufficient gain to weak audio signals from the microphone. This circuit can also be supplied from the voltage baterry 3 to 9 volts if necessary. Take a note that the microphone used in this pre-amp circuit is electret type. (more…)