Schematic | Circuit guide | Manual Wiring diagram | Electronic
Showing posts with label transistor. Show all posts
Showing posts with label transistor. Show all posts

Bass and Treble Control without any IC and Transistor

Posted by Unknown Friday, December 20, 2013 0 comments
This low cost bass treble circuit consists of some capacitors, resistors, and two T/C pot for BASS and TREBLE control. this circuit can be made without even a veroboard. You just solder components as this circuit network is not so complex. It has only two-pin parts. Let’s take a look at he circuit diagram. Nothing to say about it, as it is so simple that a beginner level hobbyist can even understand and build this circuit.

Bass and Treble Control without any IC and Transistor

But there are some -ve points of this circuit which I must say, after giving you the circuit. As no external power supply, the O/P power is much lesser than I/P power, so volume decreases. The treble control doesn’t act as linear, it increases treble a lot in the end pot side

Transistor AM Modulator Circuit Diagram

Posted by Unknown Saturday, August 3, 2013 0 comments

Modulation
is the process of changing some characteristics (e.g. amplitude,
frequency or phase) of a carrier wave in accordance with the intensity
of the signal is known as modulation.

The figure shows the electronics circuit of a simple am modulator. It is essentially a CE amplifier
having a voltage gain of A. The carrier signal is the input to the
amplifier. The modulating signal is applied in the emitter resistance
circuit. 

The carrier ec is applied at the input of the amplifier and the modulating signal es
is applied in the emitter resistance circuit. The amplifier circuit
amplifies the carrier by a factor A, so that the output is Aes. Since the modulating signal is a part of the biasing circuit, it products low frequency variations in the emitter circuit. This in turn causes variations in “A”.

The result is that amplitude of the carrier varies in accordance with the strength of the signal. Consequently, amplitude modulated output is obtained across RL. It may be noted that carrier should not influence the voltage gain
A; only the modulating signal should do this. To achieve this
objective, carries should have a small magnitude and signal should have a
large magnitude.