We're almost finished. All we need to do now is install a few remaining parts that have to be handmade - for that "old-world craftsmanship" touch! We'll prepare all those parts now for further assembly. We give you plenty of enameled wire, but if you mess up, you can get a whole 50' spool of it from Radio Shack (278-1341).

ˆ41. Winding L1 and L3 toroid RF coils (two identical units ): Locate 2 of the

donut shaped yellow toroid cores provided in the kit. Cut 12" of the enameled magnet wire and, following the drawing, thread the wire through the core 19 times - not 18, not 20; it MUST be 19 times through the core, pulling each turn gently tight. Winding too tightly runs the risk of scraping off the enamel insulation and shorting the wire. Tin each end with solder by holding your soldering iron and solder the wire ends until the insulation melts away and the copper wire underneath coats nicely with solder. Tin all the way up to the toroid core body.

19 turns through center of core

IMPORTANT: Loop the first w inding through the front of the core as show n.

ˆ42. Winding L2: Locate the remaining yellow toroid core and cut 15" of the enameled magnet wire. Wind 22 turns through the core using the same procedure as above. Tin the wire ends as before. Mark this part with a piece of tape, a dab of paint or a magic marker. We don't want to confuse it with the other two toroid coils wound just before!

22 turns through center of core

IMPORTANT:

Loop the first winding around the front of the core as shown.

ˆ43. Winding T2: Locate the smaller of the two 2-hole ferrite cores. Cut off one 11 inch length of enameled magnet wire and thread the wire through the core 6 times, pulling each turn gently tight. That's 6 times through each hole, resulting in 6 complete whole turns through the core. Be especially careful not to strip the insulation by pulling too tightly around the core.The amount of wire cut for this task is the proper amount. If you have too little or too much, then you have not wound the core correctly.

QAMP-40 • 10

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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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