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Multiplexer Circuits
/ Scanner Circuits
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Last Updated on:
Friday, June 04, 2021 01:53 PM |
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Links to electronic circuits, electronic schematics and designs for engineers,
hobbyists, students & inventors: -
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PIC Based RS485 Multiplexer - Recently, I had to design a circuit
real quick that transmitted 4 parallel TTL data bits over 350m of twisted
pair cable. I needed to feed in four parallel data bits at one end, and get
4 parallel data bits out the other end, completely transparent to the
transmitting and receiving circuits(added 11/05) |
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Printer Port Controls Video Multiplexer - 08/01/96 EDN-Design
Ideas....The circuit in Figure 1 is a four-channel video-signal multiplexer.
Eight-bit binary data (of which only 3 bits are used] from a PC's parallel
printer port controls the multiplexing operation. The inputs for all the
channel....[Design Idea by Shyam Tiwari, SR&HPG, IGCAR, Kalpakkam, India] |
| Scanmate Audio Activated Recorded -
Add this easy project to your regular scanner or DX'ing apparatus and never
miss action again. Or use this system to check a range of frequencies
for band activity when you're not there. I use it to check a range of
'secret' frequencies overnight when I'm sleeping. Works for
me....[Tony van Roon's circuit] |
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Short-wave scanner converter - Schematic only, no circuit description
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The Capacitance Multiplier - The power supply for the original 1969 JLH
design included a form of capacitance multiplier to reduce the amount of voltage
ripple on the supply rail. The capacitance multiplier circuit has been developed
further, by Rod Elliott of Elliot Sound Products, and the results published as Project
15 at the ESP Audio Pages. The modified circuit is suitable for both the original 1969
JLH amplifier (using only the positive half of the circuit) and the 1996 update. The
design considerations for the capacitance multiplier, its benefits, and a comparison
with voltage regulators are included in the Project article. ….(design added 11/08)
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Tiny RGB Video Multiplexer Switches Pixels at 100MHz - DN205 Design
Notes (Linear Technology) (app note added 6/06) |
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Two Diode Odd-Order Multiplier - It is often necessary to multiply the
frequency of low noise oscillators without significantly degrading the phase noise
beyond the theoretical 20 log (N). Low noise frequency doublers constructed with
Schottky signal diodes are readily available but higher-order multipliers often....
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Video multiplexer uses high-speed op amps - 21-Aug-03 Issue of EDN
Video multiplexers route video from several sources to a single channel. Low-end
consumer products use CMOS analog switches and multiplexers, such as the 4066 and
4051. Unfortunately, these devices have a series on-resistance that ranges from
approximately 100Ω to 1 kΩ, a resistance that is not constant with video level and
that appears in series with the signal....[Design Idea by Bruce Carter, Texas
Instruments, Dallas, TX] |
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Voltage reference stabilizes current sink - 18-Feb-10 Issue of EDN
Produce a stable current for long-term component testing....[Design Idea by Suded
Emmanuel, Emmanuel’s Controls, Auckland, New Zealand] |
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Voltage Regulator controls scanner Lamp brightness - 05/13/99 EDN-Design
Ideas....An image-scanning device performs best when the scanner IC controls the
brightness of the image reflected into the light sensors. The best way to control
brightness is by adjusting the intensity, or light output, of the fluorescent lamp
that shines light....PDF contains many circuits, scroll to find this one.… [Design
Idea by Chester Simpson, National Semiconductor, Santa Clara, CA] |
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