PARTS LIST

CAPACITORS

ˆ1 10 pF ceramic disc capacitor [marked 10] (C30)

ˆ1 47 pF ceramic disc capacitor [marked 47] (C15*)

ˆ4 100 pF disc capacitor [marked 100, 101, or 100K] (C5,15*,16*,17)

ˆ1 330pF disc capacitor [marked 330 or 331] (C2)

ˆ6 .001µF disc capacitors [marked .001, 102, or 1nF]

(C1,3,16*,20,21,25)

ˆ1 .0039 uF disc capacitor [marked 392 or 392K] (C31)

ˆ4 .01µF disc capacitors [marked .01, 103, or 10nF] (C4,6,8,28)

ˆ6 .1µF ceramic disc capacitor [marked .1 or 104] (C7,10,12,18,19,29)

ˆ2 1µF electrolytic capacitors (C9,24)

ˆ3 10µF electrolytic capacitors (C11,22,23)

ˆ2 220µF electrolytic capacitors (C13,14)

ˆ1 1000 µF electrolytic capacitor (C26)

INDUCTORS

ˆ2 1 µH inductors [looks like a resistor with brown-black-gold bands] (L1,L2)

ˆ1 12 µH inductor [looks like a resistor with brown-red-black bands] (L3)

ˆ2 Shielded can inductors [marked 42IF-103] (T1,2)

ˆ1 Shielded can inductors [marked 42IF-123] (T3)

RESISTORS

ˆ1 2 ohm [red-black-gold] (R15)

ˆ1 100 ohm [brown-black-brown] (R26)

ˆ3 270 ohm [red-violet-brown] (R16,22,25)

ˆ8 1K ohm [brown-black-red] (R3,7,9,10,13,17,18,24)

ˆ5 10K ohm [brown-black-orange] (R6,8,11,19,23)

ˆ2 22K ohm [red-red-orange] (R2,4)

ˆ3 100K ohm [brown-black-yellow] (R1,5,20)

ˆ1 1M ohm [brown-black-green] (R12)

SEMICONDUCTORS

ˆ1 Red LED (D2)

ˆ1 1N270 diode, glass bead style (D1)

ˆ1 Varactor diode, transistor style body with two leads (MVAM108) (D3)

ˆ3 NPN transistors, 2N3904 or similar (Q1,2,3)

ˆ1 LM358 8-pin DIP IC (U1)

ˆ1 LM386 8-pin DIP IC (U2)

SR2 10

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Ramsey Electronics SR2 manual Parts List Capacitors, Inductors, Resistors, Semiconductors

SR2 specifications

The Ramsey Electronics SR2 is a versatile and robust RF transmitter designed for a range of applications, including hobbyist projects, educational purposes, and practical uses in the field of amateur radio. Its compact size and user-friendly design make it a popular choice among enthusiasts and professionals alike.

One of the standout features of the SR2 is its frequency range, which typically spans from 88 MHz to 108 MHz. This wide range allows users to operate within the FM band, making it suitable for transmitting audio signals, music, or voice communications. This flexibility is particularly advantageous for those interested in creating their own radio stations or conducting experiments in radio frequency communication.

The SR2 utilizes advanced technology to ensure high-quality transmission. It incorporates modulation techniques that enhance audio clarity and reduce noise, resulting in a smoother listening experience. The transmitter is also equipped with a low distortion audio preamplifier, ensuring that sound quality remains pristine even at higher transmission stages.

Another important characteristic of the SR2 is its ease of assembly. The kit comes with all necessary components, including a printed circuit board (PCB), which simplifies the building process for users. Detailed instructions guide the user through the assembly, making it accessible even for those with limited electronics experience.

The SR2 also boasts a power output of approximately 100 mW, allowing for a transmission range of up to several miles, depending on the surroundings and antenna used. This power level strikes a balance between effective transmission and energy efficiency, catering to various operational settings.

In terms of design, the SR2 features a compact enclosure that protects the internal components from dust and damage, which is vital for maintaining reliability in various environments. Its user-friendly interface includes adjustable controls for tuning and volume, enabling users to customize their transmission settings easily.

Additionally, the SR2 is compatible with a variety of external audio sources, such as microphones, CD players, and smartphones, enhancing its versatility. The unit can be powered by standard power supplies or batteries, making it suitable for both portable and stationary use.

Overall, the Ramsey Electronics SR2 is a well-designed RF transmitter that combines quality, functionality, and ease of use, making it an excellent choice for anyone looking to explore the world of radio transmission.