Valve Detector Receiver

Author

Message

< Radio Frequency Electronic ~ Valve Detector Receiver

eric

Posted: Mon Aug 28, 2006 10:54 pm Post subject: Valve Detector Receiver

Site Admin Joined: 01 Jan 1970 Posts: 311

B. Kainka
The valve detector receiver is the logical extension of the crystal
detector. This circuit can achieve astonishingly good selectivity,
since the rectifier circuit is designed to have very high
impedance. The valve detector receiver can be connected to
an active PC speaker or a crystal earphone, for example, and
it generates genuine ‘valve sound’.
The EAA91 is a dual diode with a 6 V / 300 mA filament.
In contrast to a semiconductor diode made of germanium or
silicon, it does not require a minimum voltage (threshold voltage)
to arrive at the knee of its characteristic curve. In fact,
some electrons will reach the anode even if there is no anode
voltage present. A short-circuit current of around 30 μA can
be measured. A voltage of no less than 0.5 V appears across
a load resistance of 1 MΩ. The

All times are GMT

Page 1 of 1 Electronics Circuits index ~ Radio Frequency Electronic

Topic	Author	Forum
Similar Topics
Vibration Detector	eric	Micro-D/Pascal/Avr
Electrically Isolated Zero-Crossing Detector	eric	Analog Electronic
Tube Box — that authentic valve sound — using diodes	eric	PIC Project

Audio power, headphone and pre Amplifier, Digital audio circuits, Loudspeakers projects
PLC articles, examples, hardware, hints and tips, software