Locked Loop (PLL) Circuits, Page
PLL's: #'s - A B - O
PQ - Z Last Updated on:
Monday, July 11, 2016 02:00 PM
Links to electronic circuits,
electronic schematics, designs for engineers, hobbyists, students & inventors:
1W Portable PLL transmitter - This small FM transmitter includes a
limiter, a microphone Amplifier and a PLL digital tuning. All the parts are
placed on one circuit board. The RF power is….(electronic circuit added
8W PLL Stereo Transmitter with LCD - Very stable FM transmitter based on
TSA5511 synthesizer. Frequency is performed with three buttons through PIC16F84
microcontroller. Frequency is displayed on 16x1 LCD.
Audio noise generator drives earphones or small speaker - This is a circuit
that generates white noise, rolled-off to drive earphones or a small speaker. White
noise creates is a "rushing" sound, which sounds something like air rushing by your
ear(s). White noise would be flat with frequency, and since this circuit rolls off
within the audio range, I refer to it as "rolled-off" noise. White (or rolled-off)
noise(circuit added 6/07)
AVR ATMega8 board for PLL MC145170 - This board allow to manage a FM
transmitter including a Phase Locked Loop (PLL)on a serial bus (SPI) like a MC145170.
A current frequency is memorized in EEPROM to configure PLL at power up. Three
auxiliairy frequencies are available for maintenance function and/or HF adjust. A
local interface include 4 keys and a LCD display enable to modify transmitter
parameters. This board can be completely drived from a serial link RS232 (19200
Bds,8b data,2b stop, no parity). A temperature sensor enable to control working
temperature and 2 analog input are used for HF power measure (Forward and Reflected).
Information about TOS protection activation is processed by this board to inform user
(local and remote) on a TOS Alarm. ….(electronic schematic added 11/08)
The circuits on this site are designed by David A Johnson - unless otherwise noted. David A. Johnson & Associates. All Rights reserved. Linking is ALLOWED but COPYING any content or graphics to your web site is EXPRESSLY PROHIBITED.