Secondary leads (wound previously)

1 turn with loop then

another turn

Twistthe loop togethertightly (notshown tightly forclarity)

ˆ47. Locate the smaller transformer (T2) and install it snugly on the PC board.

ˆ48. Install the larger transformer (T1) into the indicated location on the PC board.

ˆ49. Install L1, a 15 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.

ˆ50. Install L2, the 16 turn toroid inductor - you marked it, remember?

ˆ51. Install L3, the remaining 15 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-30.

 

•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!.

ˆ1. Rotate Bias pot R4 fully CCW.

ˆ2. Connect a multimeter to TP1 ; set the meter to read up to 5 volts DC.

QAMP-30 • 12

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Ramsey Electronics QAMP30 manual Initial Tests
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QAMP30 specifications

Ramsey Electronics QAMP30 is a versatile audio amplifier designed for a range of audio applications. This compact yet powerful amplifier is specifically engineered to provide quality sound in a small footprint, making it ideal for home audio systems, portable audio setups, and compact installations.

One of the main features of the QAMP30 is its robust 30-watt per channel output, delivering clear and dynamic sound that can fill a room. Its solid state design ensures reliability and durability, making it suitable for both casual listeners and audiophiles. The amplifier supports continuous operation, allowing users to enjoy music for extended periods without worrying about overheating or performance degradation.

In terms of connectivity, the QAMP30 is equipped with multiple input options. It includes RCA inputs for easy connection to various audio sources, such as televisions, DVD players, and computers. This flexibility allows users to integrate the amplifier seamlessly into their existing audio setups. Additionally, the amplifier features a 3.5mm auxiliary input, further expanding its compatibility with portable devices like smartphones and tablets.

The QAMP30 also incorporates advanced circuit design technologies to enhance audio performance. Its low noise floor and high signal-to-noise ratio ensure that audio playback is clean and free from unwanted distortion. This feature is particularly important for critical listening environments where audio fidelity is paramount.

Moreover, the QAMP30 has an integrated volume control knob, giving users direct access to adjust their listening levels easily. The simple, user-friendly interface and compact design permit versatile placement in various setups, whether on a shelf, desk, or installed within a larger audio system.

Furthermore, the amplifier is equipped with built-in protection features, such as thermal overload and short-circuit protection, safeguarding the device and connected audio equipment from damage. The overall build quality of the QAMP30 reflects Ramsey Electronics' commitment to producing reliable and effective audio products.

In summary, Ramsey Electronics QAMP30 is a compact, powerful audio amplifier featuring 30 watts per channel output, multiple input options, advanced circuit technologies, and built-in protection features. Its user-friendly design and high-performance characteristics make it an excellent choice for anyone looking to enhance their audio experience.
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