Initial Tests | Ramsey Electronics QAMP40 specification

Secondary leads (wound previously)

1 turn with loop then

another turn

Twistthe loop togethertightly (notshown tightly forclarity)

47. Locate the smaller transformer (T2) and install it snugly on the PC board.

48. Install the larger transformer (T1) into the indicated location on the PC board.

49. Install L1, a 19 turn toroid inductor wound previously. If desired, a small dab of hot melt glue, bathtub sealer, or caulk may be used to secure the toroids.

50. Install L2, the 22 turn toroid inductor - you marked it, remember?

51. Install L3, the remaining 19 turn toroid inductor.

This completes the assembly of your QRP power amplifier. Now's a good time to give your masterpiece a good going over, being especially alert for any:

•bridged-over solder joints;

•misplaced components;

•transistors or diodes placed wrong;

•electrolytic capacitors installed wrong.

INITIAL TESTS:

To prepare your amplifier for testing you'll need the following:

•1. Multimeter capable of measuring voltage and current.

•2. 12 volt DC power source of at least 3 amp capacity.

•3. Suitable dummy load and resonant antenna.

•4. QRP transmitter with a power output in the ½ to 2 watt range, such as the Ramsey QRP-40.

•5. Proper cables to interface between the QRP transmitter and the QRP power amplifier.

With the above all set up and handy, let's get testing!

1. Rotate Bias pot R4 fully CCW.

2. Connect a multimeter to TP1 ; set the meter to read up to 5 volts DC.

QAMP-40 • 12

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.