Update for 31-01-22 11:56

tech/Impedance.wiki

@@ -41,3 +41,21 @@ f is the AC signal frequency (in hz),
 and C is the capacitance (in f)
 
 NOTE as the frequency increases, the capacitive reactance decreases
+
+== Impedance matching ==
+
+Internal impedance of a source limits its ablity to deliver power. A D cell for
+example has a lower impedance than a hearing aid battery, so despite both
+creating a voltage of 1.5V, the D-cell is able to deliver more current.
+
+When the impedance is matched between two devices the power delivery is more
+efficent. Most ametuer equipment has an impedance of 50ohms, including antenna
+feed points, coax, and transceivers. When this impedance does not match,
+[[SWR]] is formed and can cause damage to the transceiver.
+
+To match the impedance of two circuits, LC circuits are used to match the
+impedance. Two types are the pi and T network circuits, named such due to their
+appearance.
+
+Impedance matching can also be performed by transformers. Imedpance
+transformers do this exact task.

tech/Rectifier.wiki

@@ -0,0 +1 @@
+= Rectifier =

tech/electronics.wiki

@@ -47,18 +47,24 @@ Also see
 * [[ADC]]
 * [[DAC]]
 
-== Combinational ==
+== Practical circuits ==
+
+* [[Rectifier]]
+
+== Digital logic circuits ==
+
+=== Combinational ===
 
 * [[multiplexer|Multiplexer]]
 
-== Sequential ==
+=== Sequential ===
 
 * [[buffer|Buffer]]
 * [[Flip-flop]]
 * [[registers|Registers]]
 * [[counters|Counters]]
 
-== Theoretical/Digital Logic ==
+=== Theoretical ===
 
 * [[K-map]]