Massive Audio DB8000 Manuel d'utilisateur télécharger pdf (Page 57)

Housed

in a plastic instrument case, the AMLIGNER

can be

assembled and wired in a matter

minutes.

When wiring components

the

terminal

strip, be

sure to observe polarity

orientation of diode

Dl.

I-

.-1'BOO

SECOND -.

(A)

12V

(c)

400V

Fig. 2. Voltage

and current waveforms

include: (a)

sawtooth voltage

across Cl; (b)

current pulse

through D1;

and

(c)

ringing

waveform across C2.

February, 1967

which is in series

with switch Si, limit-

ing

resistor

Rl,

and capacitor Cl, shunt-

ed by D1

and the primary of Li, a loop -

stick antenna. The "heart"

of the circuit

is DI,

a four -layer

diode which snaps on

with

12 -volt forward

bias and

snaps off

when

the

current

through

drops

be-

low 1

milliampere.

With SI closed,

Cl begins

to charge

through Rl. When

the

capacitor

charge

reaches 12 volts, DI

avalanches

and the

capacitor discharges

through the pri-

mary of

L1. With

Cl discharged, D1

turns

off and does not turn

again

until Cl recharges to

volts. This

on-

off

cycle occurs at a

rate

of 800 times

second, producing a

sawtooth

voltage

waveform as shown

in Fig.

2( a) .

The

waveform

of the current through D1

shown

in Fig. 2 (b) .

As DI turns off, the sudden decrease

current sets

an oscillating current

of a

few hundred microseconds

duration,

and

at the

natural resonant frequency

the

C2 -L1

tank circuit, producing the

ringing waveform

shown in Fig. 2(c).

(Continued

on page 99)

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Massive Audio DB8000 Manuel d'utilisateur Page 57

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