(C) Oleg AKA Olav <Oleg.Bashtenko@p10.f17.n4623.z2.fidonet.org>
The converter 5 -> 12 for feeding VGshki.
-------------------------------------------
<+5 V
L1)
)
KD522)
K142EH8B curves. +12 B
>>
KT961 K input. on SH 93
/
500 B- _____ E
4.7KOm
L1 wire dangle 0.35 for the ferrite ring 10 mm in diameter.
number of turns-25
Resistor at 4.7 Kom exhibited mode transistor.
Simply put - not warmed to the transistor and the input Krenek
was 20-23 volts. Subsequently, for greater reliability, since
setting can measure the resistance of the resistor and solder
the shoulders respective denominations constant resistors. The
scheme is tested, I have been working for 4 years without any
problems with VGshkoy. Plus special this scheme is that if you
drive, 3.5 ~, and it takes him only 5 volts, the need for a +12
V power supply unit disappears. Then your Speccy feeds only on
+5 V! 500 KHz is taken with the 12-th output K555IE5. In a real
circuit, this conclusion not used. Our task is to apply for the
14 th conclusion 1MGts (clock frequency VG93) and divide the
frequency by 2. In some schemes, such such as BETA DISK
INTERFACE, 14-second output is connected to a 1-m. In this
case, it must be disconnected. Pre-convolution with scheme,
since different types of controllers, this subgroup can be
implemented in different ways. In general, little knowledge a
bit of work, and one problem you will be less. :)
