•Insert the part, oriented correctly, into its correct holes in the PC board. If helpful, gently bend the part’s wire leads or tabs to hold it in place, with the body of the part snugly against the top side (component side) of the PC board.

•Solder all wires or pins of the part, whether the 2 wires of a resistor or the 3 or 4 wires of a transistor.

•Trim all excess wires extending beyond each solder connection, taking care that wire trimmings do not become lodged in PC board solder connections.

ˆ1. Install S1, PC mount pushbutton switch. Solder all 6 pins securely.

ˆ2. Install J1 and J2, PC mount RCA phono jacks. Solder all 4 pins on each

securely as these connectors will be subjected to some stress when coax cables are connected to them.

ˆ3. Install J3, PC mount DC power jack.

ˆ4. Install relay K1. Notice that it installs only one way.

ˆ5. Install potentiometer R4. This pot allows adjustment of the bias to the power transistors.

ˆ6. Install C9, .01 µf disc capacitor (marked .01 or 103 or 10 nf).

ˆ7. Install Q5, 221334 PNP transistor, oriented with the flat side toward D2.

ˆ8. Install R6, 470 ohm resistor (yellow-violet-brown).

ˆ9. Install R10, 51 ohm resistor (green-brown-black).

ˆ10. Install R11, 2.2 K ohm resistor (red-red-red).

ˆ11. Install R12, 10 K ohm resistor (brown-black-orange).

ˆ12. Install D2 and D3, 1N4148 style signal diodes (glass body with black band). Pay special attention to the banded endS. The banded end on a diode is the cathode and must be oriented correctly or the circuit will not work. Both diode D3 and diode D2 are detectors for sensing applied RF power.

ˆ13. Install C10, .1 µf disc capacitor (marked .1 or 104).

ˆ14. Install R7, 100 K ohm resistor (brown-black-yellow).

ˆ15. Install Q3 and Q4, 2N3904 NPN transistors, observing proper orientation of the flat side. These two transistors amplify the signal diode's output to a level high enough to close relay K1.

QAMP-40 • 7

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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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