7412533119

HERES THE LIBRARY YOU NEEDI

101WAYS

by Bob Middleton BEST-SELLINO

SAMS BOOKS

NEWEST VOLUME

•    “101 Ways to Use Your

Audio Test Equipment”

A practical. tnvaluahle "how-to-do-it” book for audio t«at *.    work. Describea uae* of a pociął

instrument*, such aa harmonie, diatortion metera, intermodu-lation-diatortion analyzers, audio wattmetera, audio VTVM ’a and tone-burat generatora; cov-era generał uaea of regular VOM'i, VTVM’a, acopea and aquare-wave generatora Ln audio work. Each appiication ia croaa-indesed for quick location. 100% practical information for the profeaeional aud io technician and engineer; an important book for audio enthusiaata, too. Illuatrated; 128 pagee; co AA Only .........................

101 Ways to Use Your Sweep Generator"

Covera fuli data on connectiona reguired for each appiication, proper test procedura. evaluation of results. Includes uae of generator for checking and calibrating test instrument*, antenna measurements, RP and IF alignment, apecial uses in color receiver teata. etc. Illuatrated; 148 p.; 5H x 8V$*. #oaa Only...................................

101 Ways to Use Your Oscilloscope”

Pully covera standard and unuaual uren; shows con-noction* and equipment needed, proper procedurę* and how to evaluate results. Over 400 illustrationa of wave-forma and test *etups are ahown. A "muat” book for all scope uaers 180 pagee; 5 H x 8 W. .n en Only................................... "101 Ways to Use Your V0M and VTVM"

Describes equipment checks; DC voltage tests; ohmmeter tests; aignal-tracing tests; AC voltage tests; DC current tests; alignment applications; color TV tests. Covers all connectiona and equipment required for each test and how to perform it. 1 llus- c/lnn trated; 116 pagee; 5H x 8H'- Only.......

“101 Ways to Use Your Signal Generator"

Complete data on fuUsst uae of this important instrument. Each appiication ia fuUy and dearly de-ser i bod and illuatrated. Includes proper proceduro* for antenna tests; AM-FM receiv«r tests; TV set tests; component UmU. Illuatrated; 128 paRM; Syix8yi\ODly.........................

ORDER THE COMPLETE LIBRARY

I

Order from your Sam* DUtrlbutor todoy, er moll to Howord W. Somt 4 Co., Inc., Dopt. K-19, 220! Eotl 46th St., Indianapolis 6, Ind.

Send me ths tollowing books:

□    "101 Wsys to lite Youi Audio Test Equip." (TEM-5)

□    “101 Ways to Usa Your Sweep Generator'* (TEM-1)

□    “101 Ways to Use Your Oscilloscope" (TEM-2)

□    “101 Ways to Use Your V0M and VTVM" (TEM-3)

□    “101 Ways to Use Your Signal Generator” (TEM-4)

Nom*.

Addron.

Readouts and Counters

(Continued from page 591

electron stream thus rcvolvos likc the spoke of a wheel. remaining in each of the ten positions used until the next in-put pulse is applied. After ten input pulses, the electron stream is back to the initial anodę target. and an output pulse. as is usual for such decadc counters, is produced at that point.

A morę complete understanding of this action is possihle with the help of Fig. 9. This shows that two other elec-trodes are associatcd with each target. The one identified as the spade is used to "lock" the electron stream in its path to one anodę until the next input pulse is applied. The other electrode. known as the switching grid, is used to transfer the electron stream to the next target. The not unexpected sequonce from 0 to 9 identifies the individual targets in the sequcnce.

Although it is not shown in Fig. 9. all even-numbered switching grids arc tied together internally. rcducing the number of base pins rcquired and sim-plifying Circuit wiring. For the same reasons, the odd-numbered switching grids arc also connected internally. Al-ternatc triggering of the odd and ovon grids will deflect the electron stream so that it transfers from target to target in sequencc.

A Circuit designed around the MBS tubę is shown in Fig. 11. The tubę it-self appears in Fig. 10. In the Circuit shown. a binary stage is used to trigger the switching grids. The back-and-forth action of two triodes in the binary provides the alternate switching required. Cathode-follower cou-pling is used to reduce the loading effect on the binary Circuit.

As ever. there must be some way of clearing the tubę and re-setting to the 0 target. In the technique used. a posi-tive pulse applied to the common cath-ode cuts off the electron stream alto-gether, thus providing clearing. The pulse is applied at the point marked "pin D, elear" in Fig. 11. A negative pulse is simultaneously applied to the Circuit, fceding to spade 9 at the point marked "pin H, re-set." This causes the beam to form in the 9 position, where it is ready to be transferred to the initial or 0 position.

A check of the Circuit will show that the negative re-set pulse is also applied to the binary stage used for switching. Action of the binary then advances the heam to position 0, the desired start-ing point.

The MBS tubę is identified as a type BD300 or BD301. A 5963 is used as the binary. The two sections of the 12AU7 act as the cathode followers, one for each sidc of the binary. For simplicity. only some of the targets with their associatcd electrodes appear in Fig. 11. Target 1 shows the types of Circuit conncctions for all odd-numbered an-odes: target 8 shows as much for oven-numbered anodes; while targets 0 and 9 show the special conncctions required for clearing and re-setting the Circuit to zero.

Another, important item in the schematic has not bcen mentioned. This tubę. the 6844A, is a Nixic indi-cator. Obviously then, the MBS and the glow-transfer tubes differ in another important respect: the former is not self-indicating. However, where the greater counting speed it makes possiblc is desired. one factor balances out another.

It would obviously be impossible to cover every Circuit and every type of indication used in electronic counting. However. the leader of this and pre-ccding articles in this scries has had the opportunity to become familiar with circuits and special components that cover the vast majority of actual applications. A fortheoming article will cover counting and coding systems ac-tually used.

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