Ramsey Electronics FM10A manual Parts List Capacitors, Resistors, Semiconductors

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PARTS LIST

CAPACITORS

ˆ4 10 pf disc capacitor (marked 10 or 10K) (C7,8,14,15)

ˆ1 18 pf disc capacitor (marked 18) (C16, see note below)

ˆ1 22 pf disc capacitor (marked 22) (C16, see note below)

ˆ1 27 pf disc capacitor (marked 27) (C16, see note below)

NOTE: Selecting 18, 22 or 27 pf for C16, establishes the FM-band frequency adjustment range. See “Choosing an Operating Frequency.”

ˆ1 220 pf disc capacitor (marked 220 or 221) (C9)

ˆ8 .001 µF disc capacitor (marked .001 or 102 or 1 nf) (C6,10,12,13,17,18,20,21)

ˆ2 .0047uF disc capacitors (marked 472) (C1,4)

ˆ4 4.7 to 10 µF electrolytic capacitors (C2,3,5,11)

ˆ1 470 µF electrolytic capacitor (C19)

ˆ1 1000 µF electrolytic capacitor (C22)

RESISTORS

ˆ2 270 ohm [red-violet-brown] (R9,R13)

ˆ1 470 ohm [yellow-violet-brown] (R8)

ˆ1 4.7K ohm [yellow-violet-red] (R11)

ˆ3 10K ohm [brown-black-orange] (R3,R6,R10)

ˆ2 15K ohm [brown-green-orange] (R3,R6)

ˆ1 150K ohm [brown-green-yellow] (R12)

ˆ1 100K yellow trimmer potentiometer (marked 104) (R7)

ˆ2 1K yellow trimmer potentiometer (marked 102) (R1,R4)

SEMICONDUCTORS

ˆ3 Glass bead diodes (similar to 1N4148) (D1,2,3)

ˆ1 2SC2498 or 2570 NPN VHF transistor (Q1)

ˆ1 18-pin DIP Custom FM Transmitter integrated circuit (U1) with matching socket

HARDWARE AND MISCELLANEOUS

ˆ1 38 KHz crystal (small silver cylindrical "can" with 2 small leads), taped to a piece of paper.

ˆ1 Shielded inductor coil (L1) (small square silver “can”)

ˆ1 Ramsey FM10A Printed circuit board

ˆ1 Plastic alignment screwdriver

ˆ1 PC board mounted push-button switch

ˆ3 RCA-type PC-mount jacks (J1,2,3)

ˆ1 2.5 mm phone jack (J4)

ˆ1 9-volt battery hold-down clamp

ˆ1 9-volt battery snap connector

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Contents FM Stereo Transmitter Partial List of Available Kits Ramsey Transmitter Kits Table of Contents Ramsey ELECTRONICS, INCIntroduction Circuit Description Semiconductors Parts List CapacitorsResistors Hardware and MiscellaneousFM10A Parts Layout Diagram REQUIRED, not SuppliedOptional Assembly Instructions First assembly stepsBuilding your FM10A Stereo Transmitter Enough said. . . Lets get building Wiring the audio input circuits RF amplifier and final components Page FM10A frequency range selection Desired Transmitter Frequency Range C16 ValueChoosing AN Operating Frequency Audio Connection Adjusting Your FM10A TransmitterTransmitting Frequency Stereo balanceUsing the FM10A Within the Home Power Supply ConsiderationsD. Power on Indicator Experimental Broadcasting Projects Antenna Ideas Troubleshooting Guide Antenna AlternativesHints Appendix a FCC Rules and Information Page Page Appendix B Understanding Legal Field Strength Why talk about acres? Summary Lawful use suggestions for the FM10AImmediately Final comment Ramsey Kit Warranty Additional Suggested Items Estimated Assembly TimeRequired Tools Total Solder Points

FM10A specifications

The Ramsey Electronics FM10A is a compact and efficient FM transmitter tailored for hobbyists, educators, and anyone with a passion for creating their own radio broadcast. This device stands out in the world of electronics due to its user-friendly design and array of features that make it an ideal starting point for both beginners and experienced users.

One of the main characteristics of the FM10A is its simplicity in setup and operation. Users can quickly assemble the kit without the need for advanced soldering skills, making it accessible to a broader audience. The transmitter operates in the FM band, allowing for high-quality broadcasts with minimal distortion. Its frequency stability is maintained through a PLL (Phase-Locked Loop) technology, ensuring that the transmitted frequency remains consistent throughout its operation.

The FM10A features adjustable transmission power, allowing users to customize their broadcast range. With a maximum range of approximately one mile under optimal conditions, this device is versatile enough for personal use, small events, or classroom demonstrations. Additionally, the transmitter is equipped with an audio input for connecting various media sources such as smartphones, computers, or other audio devices. This flexibility makes it suitable for a range of applications, from playing music to broadcasting educational content.

Another notable feature is its compact design, which makes the FM10A easy to transport and set up in different locations. The device is powered by a standard 12V supply, which is widely available, making it convenient for users at home or on the go. The lightweight nature of the unit further enhances its portability, enabling users to take their radio broadcasts anywhere.

The FM10A also includes an LED power indicator and a built-in antenna for straightforward operation. Users can enhance their transmitting range by adding an external antenna, providing further customization based on specific needs. The kit comes with comprehensive instructions to guide even those new to radio transmission through each step of assembly and operation.

In addition to its engaging technical features, the FM10A serves as an educational tool. Users can learn about radio frequency technology, electromagnetic theories, and audio broadcasting principles, making it an excellent addition to any STEM program. Overall, the Ramsey Electronics FM10A is a stand-out choice for anyone looking to delve into the world of FM transmission with a robust, user-friendly device that doesn't compromise on quality and functionality.