Mutchus

Eleven W Stereo or 22 W Mono Power Amp . Integrated AF power amps have seen great improvements in recent years offering improved power and easier use. The TDA1519C from Philips contains two power amplifiers providing 11 W per channel stereo or 22 W mono when the two channels are connected in a bridge configuration. The special in-line SIL9P package outline allows the chip to be conveniently bolted to a suitable heatsink. The TDA1519CSP is the SMD version, in this case the heat sink is mounted over, and in contact with, the top surface of the chip.  11W Stereo Amplifier Circuit Diagram The operating voltage of this device is from +6V to +17.5V. The two channels of the amplifier are different in that one channel, between pins 1 and 4, is a non-inverting amplifier, while the other between pins 9 and 6 is an inverting amplifier. It is therefore necessary in stereo operation, to wire the speakers so that one of them has its polarity reversed. Each amplifier has an input impedance of 60kΩ...

Description  The two circuits below illustrate using the 555 timer to close a relay for a predetermined amount of time by pressing a momentary N/O push button. The circuit on the left can be used for long time periods where the push button can be pressed and released before the end of the timing period. For shorter periods, a capacitor can be used to isolate the switch so that only the initial switch closure is seen by the timer input and the switch can remain closed for an unlimited period without effecting the output. In the idle state, the output at pin 3 will be at ground and the relay deactivated. The trigger input (pin 2) is held high by the 100K resistor and both capacitors are discharged. When the button is closed, the 0.1uF cap will charge through the button and the 100K resistor which causes the voltage at pin 2 to move low for a few milliseconds. The falling voltage at pin 2 triggers the 555 and starts the timing cycle. The output at pin 3 immediately moves up to near th...

This amplifier circuit using ic BA534 as a main amplifier, manufactured by ROHM ic, and packaged in SIP1-8. This amplifier circuit has a maximum output of 2.3 Watts with 4 Ohm impedance. Frequency response is between 30Hz to 18KHz. For the voltage needed at least 9 Volt and 13 Volt maximum. For a list of components can be seen below. Part List : R1 = 50K trim R2 = 33K R3 = 68R C1 = 2.2uF C2 = 220uF C3 = 100uF C4 = 47uF C5 = 470uF C6 = 100uF C7 = 47uF C8 = 100n U1 = BA534