ˆ16. Install diode D4, 1N4002 style black epoxy diode. Check positioning of the banded end.

ˆ17. Install jumper JMP2. Use a piece of scrap component lead wire bent into a "staple" shape and inserted into the board like a component. Jumpers act as electronic "bridges" carrying signals over PC board circuit traces underneath.

ˆ18. Install C13, .1 µf disc capacitor (marked .1 or 104).

ˆ19. Install L4, 10 µH inductor (green body with brown-black-black bands).

ˆ20. Install R3, 10 K ohm resistor (brown-black-orange).

ˆ21. Install C2, 10 µf electrolytic capacitor. Electrolytic capacitors are polarized with a ( + ) and a ( - ) lead and must be installed correctly for proper operation. Generally, capacitors have their ( - ) lead marked with a black stripe while PC boards have the ( + ) hole indicated.

ˆ22. Install D1, 6.2 volt Zener diode (gray body with a black band). This diode provides a stable voltage which is used to provide bias for the power transistors.

ˆ23. Install R5, 1 K ohm resistor (brown-black-red).

ˆ24. Install R2, 6.8 K ohm resistor (blue-gray-red).

ˆ25. Install R1, 1 K ohm resistor (brown-black-red).

ˆ26. Locate another 1 K ohm resistor (brown-black-red). Trim back one lead to a length of ¼ inch. Bend this wire into a small loop as shown. This loop will act as a convenient point to connect a test probe for setting

the bias voltage. Insert the resistor into the PC board and hold it carefully while you solder it to the board.

Test point

Resistor

 

 

 

PC Board

 

 

 

ˆ27. Install R8, 270 ohm resistor (red-violet-brown).

ˆ28. Install C11, .001 µf disc capacitor (marked .001 or 102).

ˆ29. Install R9, another 270 ohm resistor (red-violet-brown).

QAMP-40 • 8

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Ramsey Electronics QAMP40 manual QAMP-40
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QAMP40 specifications

The Ramsey Electronics QAMP40 represents a notable advancement in the world of audio amplification, catering to both DIY enthusiasts and professional users alike. This compact, yet powerful audio amplifier is designed for high performance while maintaining ease of use and versatility, making it an excellent choice for various applications, from home audio systems to automotive setups.

One of the main features of the QAMP40 is its robust power output, delivering 40 watts per channel into an 8-ohm load. This capability allows it to drive a wide range of speakers effectively, producing clear and dynamic sound. Users can enjoy enhanced audio quality whether for casual listening, home theater setups, or more demanding audio applications.

The QAMP40 utilizes a Class D amplifier topology, known for its efficiency and minimized heat generation compared to traditional analog amplifiers. This technology not only ensures that the amplifier can operate quietly without the need for extensive heat dissipation measures but also allows longer play times on battery-operated systems. The compact form factor makes it easy to integrate into smaller spaces where traditional amplifiers might struggle.

Another standout characteristic of this amplifier is its versatile input options. The QAMP40 includes both RCA line-level inputs and a 3.5mm auxiliary input, allowing seamless connectivity with various audio sources, including smartphones, tablets, and CD players. This flexibility enables users to easily switch between different devices without the hassle of constantly reconfiguring their audio setup.

Further enhancing its appeal is the QAMP40's user-friendly design. The front panel features a simple volume control knob and a power switch, making it straightforward for users to operate without any complex configurations. The amplifier also comes with built-in protection circuitry, safeguarding the internal components from overload and short circuits, thus ensuring reliability and longevity.

In summary, the Ramsey Electronics QAMP40 is an excellent audio amplification solution that combines compact design, powerful output, and advanced technology. Its Class D architecture, versatile inputs, and user-friendly interface make it suitable for a wide range of applications. Whether you are an audio professional seeking a powerful amplifier or a hobbyist looking to enhance your sound system, the QAMP40 offers a compelling blend of performance and convenience that can meet diverse audio needs. Invest in the QAMP40 to elevate your listening experience today.
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