Archive for May, 2008
Simple VOX
VOX is a voice controlled switch, used often for microphones replacing the classic switching button. The actuating threshold is set thru the volume potentiometer of the amplifier which command the VOX circuit. The VOX switching threshold is 600mV ( on R2 ) and the maximum input voltage must not be higher than 40Vpp.
Sound Generator - Jet engine aircraft
This is a simple sound generator to produce jet engine aircraft sounds and it will run on any battery voltage between 3v and 40v.
The circuit will produce 4 sounds : low speed sound of aircraft, high speed sound of aircraft, missile and machine gun. They are activated by connecting pins 12, 13, 14 or 15 [...]
LM138 LM238 LM338 datasheet
The LM138/LM238/LM338 are adjustable 3-terminal positive voltage regulators capable of supplying in excess of 5A over a 1.2V to 32V output range. They are exceptionally easy to use and require only 2 resistors to set the output voltage.
LM138 LM238 LM338 features:
.GUARANTEED 7A PEAK OUTPUT CURRENT
.GUARANTEED 5A OUTPUT CURRENT
.ADJUSTABLE OUTPUT DOWN TO 1.2V
.LINE REGULATION TYPICALLY [...]
