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Description:
The circuit above is an light sensitive automatic switch which functions in absence of light. The IC 4060 works as an oscillator and the generated signal is applied to the base of T4 transistor. Phototransistor T3 is in conduction by existence of light and it keeps the T5 transistor's base at ground potential.
When no light reaches the phototransistor, it gets in insulation. T3 reaches positive potential through 22kohm. T4 and T5 both gets in conductance. The oscillator signal reaches the optic coupler and lamp(s) shines.
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Description:
This is an electronic fuse that protects the load against short circuit. Relays must be chosen with a voltage value equals to the input voltage. Don't omit using the 100uF capacitor with appropriate voltage value with respect to the input voltage. If you can't provide, you can use C106 instead of BRX46.
You can adjust the current with using 10K potentiometer. If you will use the fuse with very high currents, lower the 0R6 5W resistor value (ex. 0R47, 0R33, 0R22 or 0R1). Watt value of the resistor should be increased also.
You can download ARES PCB layout file of the circuit from here .
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Description:
TDA2052 is a AB class amplifier which operates with (+,-25V) supply and generates 60 Watt power (sound) output. Since it has very low distortion and it is a AB class amplifier, it can be used in HI-FI systems. TDA2052 has mute and st-by functions so it can be controlled by external digital circuits. Very high temperature and output short circuit protections are included. You should use a heatsink to dissipate the excess heat.
Features of the Amplifier:
Supply Voltage: +,- 25V,
Maximum Output Current: 6A
Operating Temperature: 0-70 C
Power Consumption: 30W
Maximum Output Power: 60W sound power (for %1 distortion, 4 ohm - 32W RMS, 8 ohm - 18W RMS)
Output Load: 8 ohm or 4 ohm
Input Signal Voltage: 1mV(minimum), 1V(p-p)(maximum)
Input Signal Current: 1mA
Standby Mode Current: 3mA
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