Newest circuit diagrams
Bidirectional Photoelectric System
Detects and counts inputs and outputs. Suited to control Lamps, Household Appliances etc. Read more...
Smart Trailing Socket
Mains sockets switched automatically by a Control Socket Up to 1000W switched power Read more...
Radio Friendly Power Supply
Power supplies should not create any unwanted interference across the radio spectrum. Switch mode power supplies are one of the strongest sources of interference, and harmonics can be heard throughout long, medium and short wave bands. This power supply, is extremely noise free, and therefore radio friendly. In addition, it has a very high rejection of line frequency and is suitable for powering receivers and small power transmitters. Read more...
Electronic Door Release
The IC is a quad 2 input "AND" gate, a CMOS 4081. These gates only produce a HIGH output, when BOTH the inputs are HIGH. When the key wired to 'E' is pressed, current through R1 and D1 switchs Q5 on.The relay energises; and Q5 is 'latched on' by R8. Thus, the Alarm is set by pressing a single key,say one of the two non-numeric symbols. Read more...
A Bipolar Regenerative Receiver
Schematic for the 530 kHz to 1650 kHz AM Broadcasting Band. Read more...
Novel Buzzer
This novel buzzer circuit uses a relay in series with a small audio transformer and speaker. Read more...
Voltage Comparator
This circuit will provide an indication whenever the input voltage differs from two defined limits, V1 and V2. The limits are adjustable and the circuit made to trigger from the adjustable "window". Read more...
Connection Tester
A low resistance ( 0.25 - 4 ohm) continuity tester for checking soldered joints and connections. Read more...
