A function generator using the ICL8038 integrated circuit. Is has four ranges and capable of sine, square and triangle
outputs.
Electronic circuit : Multi Wire Cable Tester
A multi wire cable tester with a separate LED for each wire. Will show open circuits, short circuits, reversals,
earth faults, continuity and all with four IC's. Designed initially for my intercom, but can be used with
alarm wiring, CAT 5 cables and more.
Electronic circuit : Digital Combination Lock
A multiple input combination loack using CMOS counter IC's. Flexibility
and code change is allowed by changing output connections.
Electronic Circuit : 3 Digit Display Scoreboard
By : Milardo de Guzman
A few months ago Milardo starting to study the 8051 Microcontroller. From his research Miardo has designed a new circuit and called it "3-Digit Display Scoreboard with 4x4 Keypad Matrix".
A few months ago Milardo starting to study the 8051 Microcontroller. From his research Miardo has designed a new circuit and called it "3-Digit Display Scoreboard with 4x4 Keypad Matrix".
Electronic Circuit : Automatic Manual curtains
This hybrid circuit uses a mixture of transistors, an IC and a relay and is used to automatically
open or close a pair of curtains. Using switch S3 also allows manual control, allowing for
curtains to be left only partially open or closed. The circuit controls a motor which is
attached to a simple pulley mechanism, to move the curtains. I first started this circuit over
20 years ago and apart from now using metal gears, very little has changed.
Electronic Circuit : R5000 Receiver Interface
This circuit is a modified version of an original interface on QSL Net. It is a fully isolated interface
allowing computer control of the Trio/Kenwood R5000
receiver. Separate software is needed to control the receiver.
Electronic Circuit : IR Remote Control Modulation Detector
A circuit to extract and measure the modulated carrier of an Infra Red remote control. Note that the circuit does
not physically separate control pulses from modulation, but amplifies the completereceived signal allowing the
waveform to be displayed ideally on an oscilloscope or a frequency counter.
Electronic Circuit : Infra Red Link
This is a battery powered IR Link which may be used in more than one room. The standby current is extremely low
- giving a good battery life; and by shutting down in the presence of extraneous IR radiation it copes with the
problem of excessive output current.
Electronic Circuit : Infra Red Switch
This is a single channel (on / off) universal switch that may be used
with any Infra Red remote control using 36-38kHz. (This is a very common
remote handset frequency). In place of IR1 a TSOP1738 receiver may be
used.
Electronic Circuit : Infra Red Extender Mark 5
The Mark 5 is a much improved version
of the Mark 1 circuit and has increased range and sensitivity. It is also immune to the effects ofambient light,
daylight and other forms of interference. In addition it works with IR modulation freuencies in the range 30 to
120kHz making the Mk5 circuit the best choice for compatibility with remote controls.
Electronic Circuit : Infra Red Remote Control Extender
An Infra Red wired Repeater circuit to control appliances from a remote location.
Electronic Circuit : IR Remote Control Extender Mark 3
This Mark3 version of the Infra Red extender is a special version
designed to control appliances that use high frequency modulated IR
remote controls.
Electronic Circuit : Infra Red Remote Control Extender
This circuit is used to relay signals from an Infra Red remote control in one room to an IR controlled appliance
in another room.
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