This is the book that security professionals, security system installers and hobbyists have been waiting for. Paul Brookes launches straight into the practicalities of electronic surveillance with plenty of clear, detailed information on building the devices that are at the heart of surveillance and counter-surveillance. Self-build electronics projects are supported by principles and a brief survey of each type of device. The second edition of this popular handbook has been extended with new material on microphones, amplifiers and transmitters. A step-by-step cookbook of electronic surveillance devices and techniques Requires only a basic electronics background Practical applications and guidance for security professionalsDepending upon the circuit design and supply voltage, the transmission range will only be around 15m, which is enough to transmit into an adjoining room. ... High power transmitters The use of transmitters which have a more powerful output than the a#39;flea-powera#39; transmitters ... by TR2 and associated components, is derived from a piezoelectric microphone which drives the simple audio frequency amplifier TR1. ... for a bulky 12V Resistors R1 = 27k R2 = 330k R3 = 64 Room transmitters.
|Title||:||Electronic Surveillance Devices|
|Publisher||:||Newnes - 2001|