کلیه حقوق متعلق به وبلاگ برق - فیزیک می باشد و کپی برداری از مطالب در وبلاگ ها و وب سایت های دیگر فقط با ذکر منبع مجاز می باشد .
مدیر وبلاگ : حامد ص
3 - 5 seconds delay time 10 to 48V ac supply
R1_______________1K 1/4W Resistor (Optional, see text) R2_____________100K 1/4W Resistor R3_____________470K 1/4W Resistor C1______________47µF 50V Electrolytic Capacitor C2_____________100µF 25V Electrolytic Capacitor D1,D2_________1N4002 200V 1A Diodes Q1,Q2__________BC337 45V 800mA NPN Transistors (See Notes) RL1____________Relay with DPST switch. Coil voltage according to available power supply voltage (See text) SW1_____________SPST Toggle or slide switch (Optional, see text)
Some solid state power amplifiers make a loud thump when turned on or off.
In the circuit diagram, resistor R3 and capacitor C2 form an RC
network timer. When voltage is applied to the circuit, R3 allows C2 to
charge to about 1.2V. The transistors Q1 and Q2 are connected in a
Darlington configuration and are then non-conducting until the charge
across C2 does not exceed the sum of the base-emitter voltage of Q1 and
Q2, i.e. 0.6V for each transistor for a total of 1.2V. Once the voltage
across C2 exceeds 1.2V, Q1 and Q2 immediately run into saturation,
activating the relay RL1, which completes the circuit between the
amplifier and speaker systems.
In many cases, when dual supply is present and therefore the
secondary winding is center tapped, the circuit can be connected across
the central tap and one of the two outer leads of the winding or, on the
contrary, across the whole winding. In the latter case, the available
voltage will be twice the first case.
SW1 and R1 provide an optional mute facility: closing SW1 the Relay will go off and therefore the amplifier will be muted.
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