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

Soldering the AA7 Printed Circuit Board

ˆ1. Install J1, the RF input jack. Notice that it is connected directly to the screw hole for the extendable whip antenna. Solder all 4 points of the jack secure!

ˆ2. Install S1, one of the two push switches. Position it so that the plunger of the switch extends over the edge of the PC board. It fits correctly only one way and is on the same side of the board as J1, which you have already installed. Notice that this switch selects which preamplifier circuit will be used. We'll wire the VHF circuit path first, because it's a little easier. Solder all six points of the switch.

ˆ3. Install C3, 100 pf. immediately behind S1.

ˆ4. Install R6 100K [brown-black-yellow] next to C3. NOTE: Save the extra wires nipped away from C3, R6 and similar parts. You will use them to make jumper wires.

ˆ5. Notice that Q2, the 2SC2498 transistor is installed with the flat side facing the rear (antenna and receiver jacks) of the PC-board. Press the transistor gently but firmly into it three holes so that the exposed wire leads are as short as possible. Carefully solder all three leads on Q2.

ˆ6. Using a scrap component lead wire, install jumper wire 2 (JMP2) near S1. This connects the preamp that is selected by S1 to the coupling capacitor for the receiver jack.

ˆ7. Similarly, install JMP1. (This connects the J2 receiver jack directly to J1 and the whip antenna when S2 is in the out or off position.

ˆ8. Install R4, 100 ohms [brown-black-brown].

ˆ9. Install C6, .01 µF. which couples the output of the selected preamplifier path to the J2 receiver jack.

ˆ10. Install C2, .01 µF. When S1 is in the "out" or HF position, C2 couples the RF input to the Dual gate MOSFET preamplifier you are about to build.

ˆ11. Install R1, 1 megohm [brown-black-green].

ˆ12. Install R2, 220K ohms [red-red-yellow].

ˆ13. Install C1, .01 µF.

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Ramsey Electronics manual Soldering the AA7 Printed Circuit Board

AA7 specifications

Ramsey Electronics has long been a name synonymous with quality in the realm of amateur radio equipment and communication technologies. Among its standout products is the Ramsey AA7, a high-performance audio amplifier that encapsulates advanced features and specifications aimed at both hobbyists and professionals in need of superior sound amplification.

One of the main features of the AA7 is its robust power output. Capable of delivering up to 7 watts of audio power per channel, it is an ideal choice for driving speakers across various settings, whether in a home audio system, workshop, or small public address system. This level of power ensures that users can experience clear and impactful sound, with performances that fill the room without distortion.

The AA7 employs Class AB amplifier technology, which strikes a fine balance between high fidelity and efficiency. This design is particularly beneficial as it provides reduced heat generation when compared to Class A amplifiers while still retaining audio quality. The result is a unit that remains cool to the touch during extended use, allowing for reliable and consistent sound performance.

Another key characteristic of the AA7 is its wide frequency response, which spans from bass-heavy lows to crisp highs. This extensive range allows for versatile applications, accommodating a variety of music genres and other audio formats without compromising quality. The built-in tone controls allow users to fine-tune the sound to their liking, offering adjustments for bass, treble, and overall volume to ensure an optimal listening experience.

User-friendly design is also a hallmark of the AA7. Its compact size allows it to fit seamlessly into any audio setup, while the straightforward front panel controls make it accessible even for those unfamiliar with audio equipment. The amplifier supports multiple input sources, making it versatile for connecting a variety of devices such as CD players, smartphones, and other audio sources.

In conclusion, the Ramsey Electronics AA7 stands out as a powerful and efficient audio amplifier that combines superior technology with user-friendly design. Its impressive power output, emphasis on sound quality, and convenient features make it a valuable tool for anyone looking to enhance their audio experience, whether at home or in a more public setting. Whether used by hobbyists or professionals, the AA7 offers a compelling solution for high-quality sound amplification.