Midland Alan 48 "Precision series" Schematic Diagram
This document provides a detailed schematic diagram for the Midland Alan 48 "Precision series" radio. It outlines the electronic components and their interconnections within the device.
Circuit Overview
The schematic illustrates the various stages of the radio, including RF gain, microphone gain, RF power amplifier, and audio frequency amplification. It details the placement and connections of resistors (R), capacitors (C), inductors (L), diodes (D), transistors (Q), and integrated circuits (IC).
Key integrated circuits identified include IC LC 7120 and IC KIA 7217AP, and IC AN240P. Various components are labeled with their respective values and types, such as capacitors with values like 0.01µF, 33pF, 47pF, and resistors with values like 10kΩ, 47kΩ, 1kΩ.
The diagram also shows switches (SW) for functions like AM/FM, filter selection, and ON/OFF/Volume control. Connectors for microphone (J3), external speaker (J1), and antenna (J5) are also depicted.
Component Identification and Placement
The schematic uses standard electronic symbols to represent components. For example:
- Resistors are represented by zigzag lines.
- Capacitors are represented by parallel lines, with variations for electrolytic and ceramic types.
- Inductors are represented by coils.
- Diodes are represented by a triangle pointing towards a line.
- Transistors are shown with base, collector, and emitter connections.
- Integrated circuits are depicted as rectangular blocks with numbered pins.
Specific component designations are provided, such as R101, C101, L101, D101, Q101, and IC 201. Some components are marked with asterisks (*) indicating potential control or non-accessible points.
Visual Representation of Components
The schematic includes visual cues for component orientation and type:
- LED Display: A digital display showing "40" is indicated.
- Integrated Circuits: ICs like LC 7120 and KIA 7217AP are shown with their pin configurations.
- Connectors: Pinouts for microphone and external speaker are provided.
- Switches: Various switches (SW1, SW2, SW3, SW5, SW6) are shown in different states (ON/OFF, AM/FM).
- Power Input: A DC power input of 13.8V is indicated, along with a 2A fuse.
The diagram also includes notes regarding chassis ground and variable components.
Component List Excerpts
The schematic references specific component series and types:
- Capacitors: Values range from 0.001µF to 1000/16µF, with types like (MP), (NPO), (MC), (GR) noted.
- Resistors: Values range from 47Ω to 100kΩ, with power ratings like 1W and 1/2W indicated.
- Integrated Circuits: Specific part numbers like KIA7217AP, LC7120, and AN240P are listed.
The diagram also includes a list of components with their part numbers and associated values, such as Q101, Q201, Q202, Q204, Q205, Q207, Q302, Q304, Q501, Q502, Q504, and various ICs.
Additional Information
The document is brought to you by www.tigelco.com and is associated with RigPix Database. The product is identified as Midland Alan 48 "Precision series".
