Power Supply with Battery Backup
This is an incomplete version of the power supply used for the Alertness Monitor with hourly LED Display. This circuit used a Dual Color LED. […]
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VCO – Voltage Controlled Oscillator using Opamps
This is a Voltage to pulse converter using opamps for measuring speed or rate from a Tacho Motor mechanical coupled to a Conveyor System. See […]
Millivolt Meter using a LM3914 LED Dot Display
Here is a easy to read ‘Analog’ Millivoltmeter. Just like the Moving Coil Voltmeter, but does not have that resolution. This gives a easy indication […]
Voltage Doubler with Diodes
This is a Simple Voltage Doubler to boost 3V battery voltage to power some low-power 5V circuits. In needs a Clock input with high fan-out. […]
Analog Dial Amps-Volts-Ohms meter
This was designed, keeping in mind, that sometimes we have few components available and you could not carry your DMM somewhere, but you have to […]
Speed control with TDA1085 – PCBWay
This is a Sponsored Post, The contributions from these Sponsor Firms help enhance and improve the delabs websites and services. PCBWay a PCB manufacturer Supports […]
Printer Port 256 Relays 16K Dot Matrix
Using this circuit on Printer Port, one could drive 256 Relays or 16K LEDs as Dot Matrix display. It can be used to drive a […]
Simple Water operated relay
This was done in my early days, i have upgraded it, it ought to work, reduce the number of transistors to make it less sensitive, […]