Schematics

Process Control

AD590 – temperature
Thermocouple Amplifier
Linearizing Thermocouple
Thermocouple Amplifier
0-1V to 4-20 mA
1-5V to 4-20 mA
InfraRed – Optical Switch
InfraRed Detector

Digital Circuits

Simple Digital Counter
Running Lights
Frequency Divider
Crystal Oscillator
Simple High speed switch
Differential TTL converter

555 Circuits

OR gate with two 555
watchdog uC uP systems
fixed frequency duty cycle
Pulse width modulation
Astable Multivibrator
uC Reset Generator
LM555 Voltage Doubler

Mixed Circuits

Monostable Multivibrator
Digital to Analog
LM311 Oscillator
PLL using 4046
VCO with LM331
Digital Potentiometer

SCR and Triac

Solid State Relay
Normally Closed AC SSR
AC-AC-SSR
DC-DC SSR
2N2646 based Pulser
Drive SCR thyristor

Analog Circuits

Battery Level Indicator
Simple Sample and Hold
Sample and Hold Standby
Constant Current Source
Voltmeter Attenuator

Mains Power

Flashing Neon Lamp
Dimmer power control
Edison Bulb Life Extend
Mains Current LED
Mains Voltage LED

Discrete Circuits

Isolated dual supply
Sound to light converter
Water operated relay
Telephone Indicator
Passive volume control
RS232 Opto-Isolation
Voltage Level Indicator
Relay Driver
Constant Current LED
Voltage Doubler
FET Current Source

Opamp Circuits

Three Opamp Differential
Two Opamp Differential
Buffer Opamps
Differential Op-Amp
Inverting Opamp
Non Inverting Opamp
Digital gain control
Square Triangle Oscillator
Dual Polarity Output Amps

Power Electronics

Dual Power Supply
Single Power Supply
Battery Backup Supply
5V 1A Supply LM2575
5V Power Supply L296
Dual Power Supply
Tubelight Electronic Choke
Battery Backup SRAM
Voltage Doublers Multipliers

Instrumentation Circuits

Mains monitor LM3914
Simple Mains monitor
single digit voltmeter
Tera Ohm Chopper Amp
Tera Ohm Power Supply
High Resistance Meter
Diode Thermometer
Function Generator
Precision Digital Attenuator
Diode Leakage Tester
Precision Amplifier