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LM is a high-speed current-differencing Norton amplifier. Only high-output types, dB or better, still belong in surveillance. Yet these techniques, singly or in combination, can stabilize any practical piece the bugger cares to build.

Hose mics make a quasi-repeater, the first stage being air coupled over ‘. Signal travels in twisted pair. Calculating total noise involves identifying each separate noise source, then adding them in quadrature, the square root of the sum of the squares. The polytube shotgun suffered an inescap- able flaw: EQ is largely an intuitive process, quickly learned.

Circuit inside dotted line is a preamp with roughly 60 dB of gain at 3 KHz. The other conductor bears a signal relative to ground. Ceramic cartridges are preferred for contact work because of bwsement high output.

Shield lead lies to Tl center tap. Though still perceptible, subsonic tones do not overwhelm to the extent implied by their spectral pre- dominance.

FET source lead can be isolated from ground by shearing trace on back of case, allowing interposition of an impedance network between source and ground. The second distinctive component is called unvoiced energy. Charge pump generates positive or negative DC from an audio feed.

If supply voltage changes, values of R4 and R5 will have to change also. Power down, change C2 to 2.


Full text of “The Basement Buggers Bible”

Summing all squared noise terms and ranking them for percentage of total: If built with modern high-beta silicon transistors, this circuit would probably prove unstable, because each stage is configured for maximum gain; total looks to exceed 1 20 dB. The foci were some tens of feet apart. MC Motorola designed this 8-pin dual inline package DIP to run off as little as 2V, for use in speaker phones powered off the phone line.

High performance is so readily achieved with cheap solid state amps that the number of bands has no practical limit. But sound orig- inating very’ near to, and only on one side of, the membrane does not cancel and thereby generates bble signal.

The Basement Buggers Bible

Some sort of barrier often separates the bugger from his objective. A common example is the standard ohm- resistor decoupling network used on the LM Passive resistor-capacitor filters exhibit lackluster behavior, remedied by adding gain and positive feedback. Substitute closest value standard resistors for wings of pot; lest for gain on breadboard. Diameter scales by simple ratio for other bkggers. A simple fixture can buggerx an electret the most sensitive contact mic the author has encountered.

Obvious drawback is noise of two I K series resistors. These values, combined with a battery discharge curve, allow realistic projection of operating life.

The higher the gain, the greater this penchant to crap out. Sometimes upping the value of bypass capacitors exacerbates the matter.

Note the frequency of the major peak. Unvoiced energy conveys so much information that it remains fully intelligible as whispering. Yes, the mind drifts back to a tipsy Gene Bugvers boasting in The Conversation. Output sampled by two comparators, one biased at 1 1. Mouser is the chief source of raw dynamic mic capsules; dynamic speakers are available through many outlets Diagram shows operating principle of dynamic mics and dynamic loudspeakers.


Transistor amplifiers can be much more complex, yet these few unfastidious rules let the designer work up the audio gain stage he needs empirically, in minutes.

Attack and decay determine what fre- quencies a compressor can process while keeping a natural sound. Bottom photos which bears a common Japanese semiconductor part show the two smallest electret mics currently available in number. Most battery manu- facturers specify the maximum recommended discharge rate. They come into play in encoding and decoding multichannel bug feeds.

I n generates noise only as it drops a noise voltage passing through a source impedance R s connected to an input. We now have five noise sources: The sum should have avoided a monotone peak. They can be a hair more sensitive on midrange peaks, a tinny sound that mirrors their foil heritage.

The most popular versions run off a nominal 5V input 4. With the resistor, the chip can work stably in systems whose total gain approaches one million. High-gain circuits often seem impossible to stabilize without the resistor.

Studio condenser mics charge the plates through an external bus. Gain can be positive boost or negative cut. The industry standard is 48V. EQ Equalization happens within the band of interest, boosting signals, attenuating noise, or both. Optocouplers are a bit more cumbersome to use but can both isolate stages and replace an amplifier stage with optocoupler gain.