I have an 1800ma ac adapter, converts 110 ac to 9 volts ac. It looks just like a typical ac to dc adapter, just that it’s output is still ac. The output voltage reads as a constant 9.6 volts. What I’m needing is a dc output
I have bridge rectifiers and capacitors to convert to dc, but no 9v regulators. Do I really need to use a regulator for the output since the ac output is already regulated?
Philomel
Actually it depends on the current requirements of the load and the current capability of the converter (wall cube).
You could use a single diode and RC filter called a half wave rectifier circuit.
How muck current does the load need?
How much current does the 9VAC adapter put out?
qrk
The output of the transformer isn't regulated. You have losses in the transformer which will cause a change in output voltage if the load changes.
Rectifying the 9.6V with a full-wave bridge will give you about
12.2VDC = (9.6 * 1.414) - (2 * 0.7)
You will need a series regulator to give you stable 9VDC. You can buy a 3-terminal device or make one from a pass transistor, some resistors, and a zener diode.
?
The grid is already regulated, why regulate it twice? I would build my own power supply. Power supply means DC and only a few parts, and relatively inexpensive.
oldprof
Understand 9V AC is about 5.6V DC equivalent. So if you need 9V DC you're not going to get it from what you have.