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Feed sinewave output to line input of home stereo system. The LM suits table-model gear running off an AC-derived supply and driving small-to-medium speakers. The curves also predict double the life at half the current, or half the life at double the current.

These circuits are exportable and can meet percent of filtering needs in surveillance audio gear. Noise comes in two key species, ambient and electronic. One of the most effective contact mics-in- waiting, now a dying breed, is a phonograph cartridge.

Take a specific example, the preamp shown on this page. Circuit shown will suffice for battery-powered gear not subject to disconnection or shorts. Stabilizing high-gain circuits involves so many factors, so much trial and error, as to qualify better as art than science. Sometimes upping the value of bypass capacitors exacerbates the matter. Decay happens more slowly, 50 ms to several seconds. The possibilities presented by this flow from the attached to FET gate has been removed to show the FET, nature of single-transistor audio amplifiers.


Resultant impedance equals half the impedance of each driver.

Input network Bwsement divides the signal by T he rule in audio gear d ictates showing the source of a load impedance at le ast 1 0 times the source impedance. Nothing takes the agent out of his game quicker than constant cacophony. The reader should understand that anyone who duplicates or attempts to duplicate these bugggers, or merely buys parts to build them, might be inviting strange repercussions. This circuit’s cutoff point is – 1 60 Hz. It extends from just above Hz to about 6 KHz.

Though intuitive concepts, filtering and EQ flow from mathematic relationships whose inclusion would tend to opacify the point. A mic built to expose both sides of a diaphragm equally to sound registers little output from this noise because noise impinges equally on both sides of the membrane, thus canceling. Sometimes the customer cannot anticipate baseement trade-offs dictated by his specs.

The LM12 comes in a TO-3 case and demands a substantial heatsink. The runs off 5V and will drive loads of ohms. Eighteen dB looks puny next to the gain of a big dish.

Full text of “The Basement Buggers Bible”

It also makes the point here to distinguish between bugging and reading about bugging. In stock configuration, they can serve as extremely low- impedance microphones whose sensitivity equals that of a stock-biased electret. Practical gain rises as ambient noise falls. Emitter hasement cap C2 gives treble gain that approaches the transistor’s beta.


The latter devotes the extra space to an internal 57 The Basement Bugger’s Bible copper lattice that sinks heat through six pins into the circuit board. If supply voltage changes, buggdrs of R4 and R5 will have to change also. Broadband amps do not discriminate, and for that reason seem to exaggerate bass. Human hearing inured itself to this rumble. A differential amp can ignore the interference and boost the true signal.

Converting a PA horn to a mic is often easier than building a horn from scratch, and it gives a piece that exists in disguise. Terminals 2 and 3 are reversible, to invert polarity of output; can help stability in some high-gain circuits. Alkaline batteries possess several times the capacity of nicacLs.

The Basement Buggers Bible

Design of bugging gear requires no butgers of transistor theory, only a few basic principles. The positive DC offset present at electret mic output demands capacitor coupling into most circuits. But an op amp with enough drive power could run the diode directly, saving board space in size-critical applications.

The Xs tell voltage: