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. Green meant Alert and Red meant No Alert or...
Category: Power-Electronics
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. You can use the 74HCT540 in parallel. Work with...
What is a Relay – Jim Asks
A text chat in long ago from my email records – 2007) Jim: hello, delabs: hello Jim: i have a Small problem,it’s about relays.me: would u pls give me an information about relays,pls give...
555 multivibrator like power oscillator
This is dual 555 multivibrator like power oscillator. This is my contraption and conception but couple of decades old. It appears to have errors. It worked but the document fixing after design worked, not...
LM555 Voltage Doubler
This circuit shows the voltage doubler working with a 555. LM555 has good drive 200mA, both Vcc and Gnd. 555 has the advantage of having a high drive as well as being a Mixed...
Multi Output Instrument Power Supply
Every electronic gadget primarily needs a D.C, power supply to energize it. It also forms the basic requirement for any constructional project. consequently there is a need to obtain multiple voltage values for cost...
Connection Diagram of DC PCB SSR
This is an Application note i used to give with my ssr – app012.pdf Diagram of SSR 5000 DC 3-30 Control / 230V AC N.O. @ 3A.
2N2646 based Voltage controlled SCR Pulser
A Center tap 50Hz Step Down Transformer with two diodes is used to get a train of Positive Sine Pulses at 100Hz which is applied to Q6 base via R51. 2N2646 is a unijunction...
