Chris Colorado
New Member
Dear all,
Needed a circuit to power up few LED from 240v AC. so designed the attached circuit1 ( refer picture ). as per calculations voltage across B ( refer picture) should be ~50vdc, but when chkd with a digital voltmeter it is ~240vdc, and across A is ~140vac.
But in circuit2 it is ~330vdc ( voltage across 2.2µfd capacitor ).
when I replaced the 2.2µfd cap with a 220v/5w bulb, voltage across it is ~50vdc, and before bridge ( across A ) is ~25vac.
Why it is not always ~50vdc across B?
Many Thanks.
Chris
Needed a circuit to power up few LED from 240v AC. so designed the attached circuit1 ( refer picture ). as per calculations voltage across B ( refer picture) should be ~50vdc, but when chkd with a digital voltmeter it is ~240vdc, and across A is ~140vac.
But in circuit2 it is ~330vdc ( voltage across 2.2µfd capacitor ).
when I replaced the 2.2µfd cap with a 220v/5w bulb, voltage across it is ~50vdc, and before bridge ( across A ) is ~25vac.
Why it is not always ~50vdc across B?
Many Thanks.
Chris