Product Overview
Dynamic 8-Ohm Transducer with Attached Lead Wires - 300-8000Hz
Condition
Markings legible: RadioShack 273-092, 8Ω 0.1W, TAIWAN, with positive and negative polarity symbols. Attached red and black twisted wire leads with stripped, tinned ends.
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Product Overview
RadioShack 273-092 (catalog number 273-0092) delivers tone generation and voice audio in a compact 1-1/8 inch (29mm) round cone format. Rated for 0.10W continuous input with an 8-ohm nominal impedance, this dynamic transducer suits low-power audio circuits, benchtop breadboard projects, and replacement needs in vintage electronics.
Key Features
- Nominal impedance: 8 ohms ±20% at 1 kHz, 27 mA
- Power handling: 0.10W rated input, 0.20W maximum input
- Frequency range: 300 Hz to 8,000 Hz
- Resonant frequency: 650 Hz ±130 Hz (free air / 1V)
- Sound pressure level: 88 ±3 dB (0.89 Vrms sine wave at 1-2 kHz, measured at 10 cm)
- Frame diameter: 1-1/8 inches (29 mm)
- Pre-attached twisted red and black wire leads with stripped, tinned conductors
- Operating temperature range: -20°C to +55°C
Applications
- Soldering into small DIY synthesizers, tone generators, and 555-timer audio circuits on a workbench.
- Replacing worn or torn internal speakers in vintage handheld transistor radios and walkie-talkies.
- Installing as an audible status beeper or alert transducer inside custom microcontroller enclosures.
- Wiring to breadboard prototyping rigs for debugging low-frequency audio signals.
Frequently Asked Questions
How are the wire leads color-coded for polarity?
The red lead connects to the positive (+) terminal and the black lead connects to the negative (-) terminal, matching the polarity symbols marked adjacent to the solder points on the rear housing.
What amplifier input power is recommended for this speaker?
The speaker is rated for 0.10W (100mW) continuous input and up to 0.20W (200mW) maximum. It is designed for low-power signal outputs and should not be driven by high-wattage audio amplifiers.
What is the difference between part numbers 273-092 and 273-0092?
They are the exact same speaker. RadioShack used both the 5-digit 273-092 and 7-digit 273-0092 catalog numbering formats interchangeably for this 29mm 8-ohm model.
Generations of weekend projects found their voice through this exact 29mm cone. Wire the leads to your board, send in the signal, and hear the circuit come alive.
