• Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

one minute power

Status
Not open for further replies.

Les Jones

Well-Known Member
Most Helpful Member
The two circuits are totaly different. In the first you have a time contant of 62 seconds. (10 uF and 6.2 Meg.) In the second you have a time constant of 3.4 seconds (10 uf and about 340K. The 340K is the 6.2M in parallel with the 360K) even worse in the first circuit you charge the capacitor via the 1K and then you open the switch. In the second circuit you charge the capacitor while the input pulse is high but when it goes low the capacitor is being dischaged through the 1 K resistor. You could get round yhis by adding a diode between the input pulse and the capacitor . (+ end to the capacitor.)

Les.
 

alec_t

Well-Known Member
Most Helpful Member
Make R2 6.2meg.
 
Status
Not open for further replies.

Latest threads

EE World Online Articles

Loading
Top