Figure 1 is the front-end of a
simple frequency counter, 1 Hz to
1 MHz. I can't seem to find IC1 4583,
(I'm guessing this is a CD4583). Pin 4
of IC1 feeds the input of a CD4026.
Q1 is a 2N930 and IC5A is a 556.
I found two conflicting datasheets
on this. One says it’s a microcontroller
(which I doubt); the other says it’s a
flip-flop. I've looked at Mouser and
Digi-Key and can't find this IC, even at
some surplus places I've looked!
Can you help?
#1151 Ted Mieske
Ipurchased a model P1600-
Gemini PC- 4 mfg. by PointSource
which is now called Qioptiq. It is a
three laser diode device, 660-680 nm.
It has three fiber steel shielded optic
cables. It has two input ports, 26-pin
and nine-pin. I think the 26-pin port is
for control and monitoring. The nine-pin I think is for power in. I cannot find
the pin-out specifications to be able to
power up. Emailed Qioptiq ... no reply.
This device will be used in a
quantum entanglement project if I
can get the pin-outs. Any information
would be extremely helpful.
#1152 Michael Duc
HD44780-based LED Display:
Scrolling Text False Start
I have been experimenting with
scrolling text on some HD44780-
based LED displays of various sizes.
The commands I talk about below
are those for that device, not any
particular PIC code.
I first clear the display and home
the cursor sending a 01 command to
the display. Then, I change to One
Line mode with a 48 command. A
long text message is then sent to the
display using the data mode in a loop
to send all the characters. This
message is 72 bytes long and should
be going into LCD RAM locations 128
At this point, I have tried a
number of commands to reliably reset
the active window to the start of my
message, but none of them seem to
work for all the different displays I
have tried this on.
On some of the displays, nothing
works. Then, the text is scrolled using
the Pan Right command: 24 in a loop
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78 January 2015
R1 = 8.2M
R2, R9 = 100K
R3 = 470K
R4 = 470 ohm
R5, R6, R7 = 10K
R8 = 3.3M
C1, C2 = 1µF 63V Mylar NPO
C3 = 47µF 16V
C4 = .1µF 63V
C5 = 2.2µF 16VC6 = 10µF 16V
C7 = .01µF 63V Mylar
C8, C10 = .001µF 63V Mylar
C9 = 1µF 16V
TR1 = 1M trimmer 10T
TR2 = 1K trimmer 10T
Q1 = 2N930 or 2N2222A
IC1 = CD4583
IC2, IC3, IC4 = CD4026
IC5 = LM556
IC6 = CD4007
IC7 = 7805
DS1, DS3 = Display 7 Seg. Comm. Cath.
S1 = ON-OFF mini switch
S2 = 1X2 mini switch