. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. REAL GENERATORS The ^bridged T' attenuator—There is a useful and interesting variation of the T section, which, though it contains 4 resistances instead of 3, requires only 2 of them to be varied to vary (J. It may be derived as follows. Take an ordinary T section [Figure ); take the R^ and split it into «.-(- -1 "mr Vv^^ -AAA- 26 ^2-" R --(r) Figure two resistances {0/(1 — ())]r and {OfiX -f ())]r {Figure ). These add up to (20)1(1 — 0^) as before. Now transfor
. Electronic apparatus for biological research. Electronic apparatus and appliances; Biology -- Research. REAL GENERATORS The ^bridged T' attenuator—There is a useful and interesting variation of the T section, which, though it contains 4 resistances instead of 3, requires only 2 of them to be varied to vary (J. It may be derived as follows. Take an ordinary T section [Figure ); take the R^ and split it into «.-(- -1 "mr Vv^^ -AAA- 26 ^2-" R --(r) Figure two resistances {0/(1 — ())]r and {OfiX -f ())]r {Figure ). These add up to (20)1(1 — 0^) as before. Now transform the star between A, B, and C into a •> A. .R(=r) Figure delta (Figure ). This gives the 'bridged T\ Notice that two of the four resistances are fixed and equal the characteristic resistance of the section. The other two have values which are elegantly reciprocal, and easy to remem- Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Donaldson, Peter Eden Kirwan. New York, Academic Press
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