Microphone Hummer (oscillator) 572-B
General Radio Company; Cambridge (MA)
- País
- Estados Unidos
- Fabricante / Marca
- General Radio Company; Cambridge (MA)
- Año
- 1933 ??
- Categoría
- Aparato de medida y servicio (Equipo de laboratorio).
- Radiomuseum.org ID
- 300903
-
- alternative name: GenRad
front to back view
front viewed from top
- Principio principal
- Amplificador de Audio
- Tensión de funcionamiento
- Red: Corriente continua (CC, inglés = DC) / 6 Volt
- Material
- Metálico
- de Radiomuseum.org
- Modelo: Microphone Hummer 572-B - General Radio Company;
- Forma
- Chasis (tambien de autoradio)
- Ancho, altura, profundidad
- 79 x 42 x 50 mm / 3.1 x 1.7 x 2 inch
- Anotaciones
-
This microphone hummer is a 1KHz oscillator which is similar in principle to microphone driven tuning fork oscillators. It works by mechanically coupling a carbon microphone to an electromagnetically driven vibrator bar, adjusted to resonate at 1KHz. It appears in the Heathkit IB-1 and IB-1B impedance bridges and supplies an approximately sinusoidal, 1 KHz signal for AC impedance bridge measurements. A carbon microphone serves as the active element which drives the vibrator electromagnet, and through a transfomer supplies the 1 KHz electrical output signal. A 6 volt DC source powers the carbon microphone driven vibrator electromagnet.
The first and last years of manufacture of the 572-B are unknown, but the microammeter in the IB-1B has a manufacturing date stamped on the back: 22 November 1952.
The 572-B schematic appears in the IB-1 schematic in the Heathkit manual.
- Mencionado en
- - - Manufacturers Literature (Heathkit IB-1 impedance bridge manual (circa 1949))
- Documentación / Esquemas (1)
- - - Manufacturers Literature (schematic appears in the IB-1 manual)
- Autor
- Modelo creado por Gary Brandenburger. Ver en "Modificar Ficha" los participantes posteriores.
- Otros modelos
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Colecciones
El modelo Microphone Hummer (oscillator) es parte de las colecciones de los siguientes miembros.