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Subject: principle behind this voltage detector

Date: 02/23/03 at 10:38 AM
Posted by: janet
E-mail: janet_smith2000@yahoo.com
Message Posted:


0. can anybody tell me the principle behind this circuit? it used to

monitor the voltage level -about 8V (provided by Nang). i only know

that voltage level is depend on the zener diode and there is a

direct-coupled multistage amplifier. but i dont the mechanism of

voltage detecting.

1. what is the difference between Infrared, Ultrasonic and RF?

2. 27 MHz is VHF or HF?

3. if 1 tx/rx provides 4 command signals, can i use two tx/rx boards

(27 Mhz & 33 MHz) in order to get 8 command signals using the same


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