Position: Index > Unclassified >

Variable-capacitance-diode-sparked-vco

2017-08-21 21:09  
Declaration:We aim to transmit more information by carrying articles . We will delete it soon, if we are involved in the problems of article content ,copyright or other problems.


You can transform a 7415124 multivibrator into a wideband VCO by replacing it conventional fixed capacitor with a variable-capacitance diode. The only disadvantage of this scheme is the 30-V biasing voltage that the diode requires. Capacitors C1 and C2 couple the Philips BB909A variable-capacitance diode to the 745124.
Variable-capacitance-diode-sparked-vco

R1 and R2 are large enough to isolate ground and control voltages from the timing capacitors. Resistors R3 and R4 form a voltage divider for the 745124`s control input.



Reprinted Url Of This Article:
http://www.next.gr/oscillators/voltage-controlled/variable-capacitance-diode-sparked-vco-l13870.html