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Showing posts with label watt. Show all posts

Saturday, July 13, 2013

2 Watt FM Transmitter

CIRCUIT DESCRIPTION

The circuit is basically a radio frequency (RF) oscillator that operates around 100 MHz. Audio picked up and amplified by the electret microphone is fed into the audio amplifier stage built around the first transistor. Output from the collector is fed into the base of the second transistor where it modulates the resonant frequency of the tank circuit (L1 coil and the trimcap) by varying the junction capacitance of the transistor. Junction capacitance is a function of the potential difference applied to the base of the transistor T2. The tank circuit is connected in a Hartley oscillator circuit.

Components List

R1=220K
R2=4.7K
R3,R4=10K
R5=100ohm

C1,C2=4.7uF Electrolytic
C3,C4=1nF
C5=2-15pF
C6=3.3pF

Q1=BC547C
Q2=BD135
P1=25K
MIC=Electret Condenser Type

P1 act as condenser microphone volume level. For FM, coil will be small. Use thin gauge enamel magnet wire. the diameter of coil will be a couple mm: use ink tube from pen to form, and try 8-12 turns. Small inductance coils link

Friday, April 12, 2013

0 5 WATT MINI AMPLIFIER TDA1015T SCHEMATIC DIAGRAM

A volume control is included in schematic. Log type is required and 4k7 to 10k is about right. A dual pot is needed if you plan on using two TDA1015s to complete a stereo amp.

Chances are youll want this amplifier portable. Batteries do the trick fine, but you wont get much power out of a couple of 1.5V cells. Unfortunately the size of a decent amount of battery power will mean that the overall size of this amp will be much bigger and for that there are more benefits to be had using a device like the TDA7052 or TDA2822 for stereo.

Quick ref data of TDA1015T Chip

Supply voltage range: 3,6 to 12 V
Peak output current: 1 A
Output power: 0,5 W
Voltage gain power amplifier: 29 dB
Voltage gain preamplifier: 23 dB
Total quiescent current: 22 mA
Operating ambient temperature range: -25 to +150 °C
Storage temperature range: -55 to + 150 °C

Tuesday, April 2, 2013

5 8 Watt audio power amplifier

This amplifier circuit has a power output of a small or too low at 5.8 Watt, which uses IC KA2205. The required voltage for at least 6 volts to 18 volts DC maximum.

Schematics power audio amplifier with IC KA2205

Component List

C1 = 1uF

C2 = 100uF

C3 = 47uF

C4 = 1000uF
C5 = 0.1uF
C6 = 220uF
IC1 = KA2205