"Gareth Edwards" wrote in message
...
Hi

Can anybody explain to me exactly how this circuit functions, what it
does,
and why were the components chosen i.e. how were the resistor values
calculated etc.
Where it says "solar +ve", this is the positive pole of a small solar
panel.
The circuit works on 2 AA batteries in series.
L1, L2, R1, R2, and R3 are all resistors.
The capacitor is a 101. 100pF ceramic disc type.
Two transistors are S8050 type.
Diode is a 1N5819.

boy at first glance this circuit doesn't look like it does anything!

you got a power on led branch, that makes sense
you got an amplifier (maybe set up as an op amp?) to kick on a second
transistor that doesn't have an output.

since it is solar (i.e. solar +ve) I am assuming it is a light actuated
controller, but I don't see what it controls.

"Tater Schuld" wrote in message
...

"Gareth Edwards" wrote in message
...
Hi

Can anybody explain to me exactly how this circuit functions, what it
does,
and why were the components chosen i.e. how were the resistor values
calculated etc.
Where it says "solar +ve", this is the positive pole of a small solar
panel.
The circuit works on 2 AA batteries in series.
L1, L2, R1, R2, and R3 are all resistors.
The capacitor is a 101. 100pF ceramic disc type.
Two transistors are S8050 type.
Diode is a 1N5819.

boy at first glance this circuit doesn't look like it does anything!

you got a power on led branch, that makes sense
you got an amplifier (maybe set up as an op amp?) to kick on a second
transistor that doesn't have an output.

since it is solar (i.e. solar +ve) I am assuming it is a light actuated
controller, but I don't see what it controls.

Apologies for posting the diagram first of all.
The circuit is out of a solar powered lantern for the garden. It is
*supposed* to charge the battery during daylight hours, and then the light
(l.e.d.) comes on in the night.
I am not 100% sure that L1 and L2 are resistors, maybe they are inductors?
that would explain why they are labelled as they are. I am no electronics
genius but they look exactly like the other resistors in the circuit except
that they are slightly larger and they are green.
I would like to know how the circuit works and why each component was
chosen, because I want to use the circuit for something else.

Cheers