A passive crossover is made entirely of passive components, arranged most commonly in a Cauer topology to achieve a Butterworth filter. Passive filters use non-reactive resistors combined with reactive components such as capacitors and inductors. Very high performance passive crossovers are likely to be more expensive than active crossovers since individual components capable of good performance at the high currents and voltages at which speaker systems are driven are hard to make, and expensive. Polypropylene, metalized polyester foil, and paper-electrolytic capacitors are common. Inductors may have air cores, powdered metal cores, ferrite cores, or laminated silicon steel cores, and most are wound with enamelled copper wire. Some passive networks include devices such as fuses, PTC devices, bulbs or circuit breakers to protect the loudspeaker drivers from accidental overpowering. Modern passive crossovers increasingly incorporate equalization networks (e.g., Zobel networks) that compensate for the changes in impedance with frequency inherent in virtually all loudspeakers. The issue is complex, as part of the change in impedance is due to acoustic loading changes across a driver’s passband.

This is an high power RF amplifier circuit. With high power output, the FM signal will cover wide area. The manufacture of amplifier is very simple and easy.

Schematic Diagram:

Component Parts:
C1, C2, C3, C4 = 10 – 80pF
C 5 = 10nF
C6 = 1000pF
C7 = 100nF
C8 = 2200mF/35V
L1 1 = coil with diameter of 10 mms, 1 mm
L2 7 = coils with diameter of 10 mms, 0,8 mm
L3 3 = coils with diameter of 10 mms, 1 mm
TR1 = BLY89
RFC = RF tsok

Featured with muting facility, protection against chip over temperature, very low noise, high supply voltage rejection, and low “switch-on” noise, this amplifier circuit should be enough for your small audio system project. This amplifier is cheap, very simple and easy to build.

About TDA1910:
The TDA 1910 is a monolithic integrated circuit in MULTIWATT® package, intended for use in Hi-Fi audio power applications, as high quality TV sets. The TDA 1910 meets the DIN 45500 (d = 0.5%) guaranteed output power of 10W when used at 24V/4W. At 24V/8W the output power is 7W min.

Below is the circuit diagram of high power audio amplifier dual output at 100W max each output channel. This is a great output power with only using single chip.

Note:

• This circuit using splitted power supply, please see the IC datasheet for the recommended power supply voltage.
• Use heatsink on the chip to prevent over heating.

This is a very simple and low cost circuit of dual audio amplifier based on IC KA2211 from Samsung. With single chip, this circuit will deliver up to 5.8W on each output channel.

KA2211 is a dual audio power amplifier for consumer application. It is designed for high power, low dissipation dan low noise. Is also contains various of protectors and suitable for car audio power amplifier with high performance.

Read more about this KA2211 amplifier circuit