Transistor Schematic. C2 behaves like a low frequency decoupling of this particular resistor. When a transistor is saturated the collector current ic is determined by the supply voltage and the external resistance in the collector circuit not by the transistor s current gain.
C2 behaves like a low frequency decoupling of this particular resistor. You mentioned the difference between pnp and npn transistors in the comments. An npn transistor has a p type layer sandwiched between two n type layers and a pnp is the reverse.
The transistor t1 and t2 constitute a basic voltage controlled lf oscillator with a loudspeaker working like a load.
Resistor r3 is the collector resistance of t2. A transistor that is full on with r ce 0 is said to be saturated. The transistor t1 and t2 constitute a basic voltage controlled lf oscillator with a loudspeaker working like a load. Resistor r3 is the collector resistance of t2.
