A Pity to Throw Away Circuits and Designs



Here you can find many circuits and designs from a long time ago, but some are tested and build by myself and some are not. While I think that its a pity to throw it away, then why not share it to you all, maybe it still valuable !!! Many of these circuits and designs were made when I still in the work before, and some for my purpose also. Here they are :



  1. A long time ago, when I have 2 CPU's but only have one monitor, here is the circuit diagram. Still used till now!

  2. Universal timer using PIT-8253 timer, interface to LPT printer parallel port or PPI-8255 decoder. I designed this circuit for my LPT projects, but never built it. Maybe later, when I have more spare time.


  3. A toggle switch PCB design. I made it when I still in the old work. To run a toggle foot switch controlling blower table. The circuit diagram can be found here.

  4. Speech synthesizer board using SPO256-AL2 chip. I design this PCB to support my robotic enthusiasm. Never built it, hard to find chip!!!

  5. Cutting machine controller circuit diagram. Designed for old cutting machine at the work before. Never built it!

  6. Cast test machine (laboratory equiptment), level controller circuit diagram. This circuit was hack at the work before. Used for controlling the fluid (salt water) level.

  7. A 10 MHz 8-digits frequency counter PCB design. Never built it. Expensive part price !!!

  8. Flow coater relay circuit diagram for counter output. This circuit used for accelerated conveyor speed. There are 8 programmed speed output from a multi counter. At that moment, the circuits panel still used a combined relays, not a PLC one!!!

  9. Capacitance meter PCB design, used to measure the capacitance using a DVM. Never built it since I had my new multimeter!

  10. Stereo Amplifier PCB design, used for my old sound blaster speaker. Utilize the old speaker to run to a new sound card. it use LM386 type chip.

  11. Conveyor alarm system circuit diagram. This circuit design at my work before. There are 8 sections from input conveyor a long to output finished products. If at one section has trouble, then a long conveyor to the back must be stop, and section forward must be inform also. Never built it, my boss not approved !!! 

  12. Another 30MHz counter PCB design using serial port, utilize the old PC. Here is my prototype, PCB artwork, and the software to run it! Not tried yet!!! 

  13. Simple lithium-polymer charger PCB design, from SH-Design - lithium-ion charger. I use this design to charge my sony-ericsson hp battery!!! 

  14. I found from junk a small I/O board (top view, bottom view), but I can't configured out for what use. The top label was sign as SunStar 470Fr-5 and the s/n : PPU:97110036. The board consist of six 7-segmen display, eleven leds display, and one buzzer, and four reostats. Very suitable to build an alarm clock, or as an experiment board. I drawn the circuitry again to refresh the use or maybe it will be useful for you.


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PROJECTS 8086 PIN CONFIGURATION 80X86 PROCESSORS TRANSDUCERS 8086 – ARCHITECTURE Hall-Effect Transducers INTEL 8085 OPTICAL MATERIALS BIPOLAR TRANSISTORS INTEL 8255 Optoelectronic Devices Thermistors thevenin's theorem MAXIMUM MODE CONFIGURATION OF 8086 SYSTEM ASSEMBLY LANGUAGE PROGRAMME OF 80X86 PROCESSORS POWER PLANT ENGINEERING PRIME MOVERS 8279 with 8085 MINIMUM MODE CONFIGURATION OF 8086 SYSTEM MISCELLANEOUS DEVICES MODERN ENGINEERING MATERIALS 8085 Processor- Q and A-1 BASIC CONCEPTS OF FLUID MECHANICS OSCILLATORS 8085 Processor- Q and A-2 Features of 8086 PUMPS AND TURBINES 8031/8051 MICROCONTROLLER Chemfet Transducers DIODES FIRST LAW OF THERMODYNAMICS METHOD OF STATEMENTS 8279 with 8086 HIGH VOLTAGE ENGINEERING OVERVOLATGES AND INSULATION COORDINATION Thermocouples 8251A to 8086 ARCHITECTURE OF 8031/8051 Angle-Beam Transducers DATA TRANSFER INSTRUCTIONS IN 8051/8031 INSTRUCTION SET FOR 8051/8031 INTEL 8279 KEYBOARD AND DISPLAY INTERFACES USING 8279 LOGICAL INSTRUCTIONS FOR 8051/8031 Photonic Transducers TECHNOLOGICAL TIPS THREE POINT STARTER 8257 with 8085 ARITHMETIC INSTRUCTIONS IN 8051/8031 LIGHTNING PHENOMENA Photoelectric Detectors Physical Strain Gage Transducers 8259 PROCESSOR APPLICATIONS OF HALL EFFECT BRANCHING INSTRUCTIONS FOR 8051/8031 CPU OF 8031/8051 Capacitive Transducers DECODER Electromagnetic Transducer Hall voltage INTEL 8051 MICROCONTROLLER INTEL 8251A Insulation Resistance Test PINS AND SIGNALS OF 8031/8051 Physical Transducers Resistive Transducer STARTERS Thermocouple Vacuum Gages USART-INTEL 8251A APPLICATIONs OF 8085 MICROPROCESSOR CAPACITANCE Data Transfer Instructions In 8086 Processors EARTH FAULT RELAY ELECTRIC MOTORS ELECTRICAL AND ELECTRONIC INSTRUMENTS ELECTRICAL BREAKDOWN IN GASES FIELD EFFECT TRANSISTOR (FET) INTEL 8257 IONIZATION AND DECAY PROCESSES Inductive Transducers Microprocessor and Microcontroller OVER CURRENT RELAY OVER CURRENT RELAY TESTING METHODS PhotoConductive Detectors PhotoVoltaic Detectors Registers Of 8051/8031 Microcontroller Testing Methods ADC INTERFACE AMPLIFIERS APPLICATIONS OF 8259 EARTH ELECTRODE RESISTANCE MEASUREMENT TESTING METHODS EARTH FAULT RELAY TESTING METHODS Electricity Ferrodynamic Wattmeter Fiber-Optic Transducers IC TESTER IC TESTER part-2 INTERRUPTS Intravascular imaging transducer LIGHTNING ARRESTERS MEASUREMENT SYSTEM Mechanical imaging transducers Mesh Current-2 Millman's Theorem NEGATIVE FEEDBACK Norton's Polarity Test Potentiometric transducers Ratio Test SERIAL DATA COMMUNICATION SFR OF 8051/8031 SOLIDS AND LIQUIDS Speed Control System 8085 Stepper Motor Control System Winding Resistance Test 20 MVA 6-digits 6-digits 7-segment LEDs 7-segment A-to-D A/D ADC ADVANTAGES OF CORONA ALTERNATOR BY POTIER & ASA METHOD ANALOG TO DIGITAL CONVERTER AUXILIARY TRANSFORMER AUXILIARY TRANSFORMER TESTING AUXILIARY TRANSFORMER TESTING METHODS Analog Devices A–D BERNOULLI’S PRINCIPLE BUS BAR BUS BAR TESTING Basic measuring circuits Bernoulli's Equation Bit Manipulation Instruction Buchholz relay test CORONA POWER LOSS CURRENT TRANSFORMER CURRENT TRANSFORMER TESTING Contact resistance test Current to voltage converter DAC INTERFACE DESCRIBE MULTIPLY-EXCITED Digital Storage Oscilloscope Display Driver Circuit E PROMER ELPLUS NT-111 EPROM AND STATIC RAM EXCITED MAGNETIC FIELD Electrical Machines II- Exp NO.1 Energy Meters FACTORS AFFECTING CORONA FLIP FLOPS Fluid Dynamics and Bernoulli's Equation Fluorescence Chemical Transducers Foil Strain Gages HALL EFFECT HIGH VOLTAGE ENGG HV test HYSTERESIS MOTOR Hall co-efficient Hall voltage and Hall Co-efficient High Voltage Insulator Coating Hot-wire anemometer How to Read a Capacitor? 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