Resistors, Semiconductor Devices | Ramsey Electronics QAMP40

PARTS LIST FOR THE QAMP40 QRP POWER AMPLIFIER

CAPACITORS:

1 100 to 220 µf electrolytic capacitor [C1]

1 10 µf electrolytic capacitor [C2]

4 .1 µf disc capacitor (marked .1 or 104) [C3,8,10,13]

2 560 ρf disc capacitor (marked 560 or 561) [C4,7]

2 330 ρf disc capacitor (marked 330 or 331) [C5,6]

2 .001 µf disc capacitor (marked .001 or 102 or 1000) [C11,12]

1 .01 µf disc capacitor (marked .01 or 103 or 10 nf) [C9]

RESISTORS:

3 1 K ohm resistor (brown-black-red) [R1,5, TP1]

1 6.8 K ohm resistor (blue-gray-red) [R2]

2 10 K ohm resistor (brown-black-orange) [R3,12]

1 470 ohm resistor (yellow-violet-brown) [R6]

1 100 K ohm resistor (brown-black-yellow) [R7]

2 270 ohm resistor (red-violet-brown) [R8,9]

1 51 ohm resistor (green- brown-black) [R10]

1 2.2 K ohm resistor (red-red-red) [R11]

1 5 K potentiometer (marked 502M) [R4]

SEMICONDUCTOR DEVICES:

1 Zener diode, 6.2 volt (gray body with black band) [D1]

2 1N4148 type signal diode (glass body with black band) [D2,3]

1 1N4002 style black epoxy diode [D4]

2 Power MOSFET transistor (marked P16NF06) [Q1,2]

2 2N3904 NPN transistor [Q3,4]

1 221334 PNP transistor [Q5]

OTHER COMPONENTS:

1 Relay DPDT 12 volt [K1]

1 PC mount pushbutton switch [S1]

2 RCA style PC mount phono jacks [J1,2]

1 2.5 mm DC power jack [J3]

2 Heatsink [HS1,2]

3 Yellow toroid coil core [L1,2,3]

1 10 µH inductor [L4]

1 2 hole small ferrite transformer core [T2]

1 2 hole large ferrite transformer core [T1]

7' #24 enameled magnet wire (thin wire) [for winding L1,2,3 and T1,2]

2 4-40 x ¼” machine screw

2 4-40 hex nut

REQUIRED, NOT SUPPLIED:

Ramsey case, knob and panel set, Ramsey part no. CQRP

Matching input and output cables to existing QRP transmitter

12 volt DC power supply 3 amp rating

Proper dummy load or resonant antenna

QAMP-40 • 5

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.