Note: can only use 2.54 spacing round module row needle, it won't

Power amplifier gain using 36 db benefits:Because some audio device audio signal is too weak, with 36 db amplifier amplified sound is very big, with 20 db amplifier amplified voice on the market will be small.Such as mobile phones than computer audio signal output audio signal is weak, with 36 db amplifier amplified voice is very big.If the computer audio signal, with 36 dd amplifier amplified voice is too big, ugly voice and distortion, should turn down, the computer if the computer is not convenient to adjust, can the amplifier board input series resistance to reduce the volume (amplifier board input resistance is 1 k, change amplifier using resistance pressure volume, make power amplifier will not appear larger saturation distortion), is magnified the voice is not distortion, not bad.

Power amplifier gain using 36 db disadvantages:If the audio equipment in mute (no sound) when a faint noise signals, by 36 db amplifier would put the noise is very big, so some customers say why to have very big noise amplifier there (because of the noise from the input signal source, the audio power amplifier board input line disconnect inside the horn is no noise).The noise of the desktop computer much bigger than a laptop noise.General advice customer tests provide sound source using laptops.

Power amplifier BTL output power:DC 24 v R = 8Ω @ 1 KHZ, P = 40 w (8 the speaker is not recommended to use higher than 24 v power supply)DC 21 v R = 8Ω, @ 1 KHZ, P = 30 wDC 21 v R = 4Ω @ 1 KHZ, P = 50 w (4 the speaker is not recommended above 21 v power supply)DC 15 v R = 4Ω, @ 1 KHZ, P = 25 wDC 12 v, R = 4Ω, @ 1 KHZ, P = 17 wDC = 8 v, R = 4Ω @ 1 KHZ, P = 6 w (double lithium battery power supply 5 V to 8.4 V)

Power amplifier board matters needing attention:After 1, amplifier board power supply, speaker of the dc voltage between two bonding pad 0 v, horn between welding plate and GND half dc voltage of the power supply voltage.2, use 4 speakers, power supply voltage cannot be more than 21 v, otherwise high fever easily damaged power amplifier chip.Choose 8 speakers, power supply voltage cannot be more than 24 v, high breakdown voltage amplifier chip.3, power amplifier boards after electrify, hand cannot touch board components pins, because human interference signal interference digital power amplifier of the timing, cause damage to the chip, the human body with strong electrostatic, high pressure will be broken down chips, be sure to know the harm of human body static electricity.4, power supply voltage should be stable, try to use switch power and battery power.Cannot exceed the board work voltage, or burn out chips, digital power amplifier, temperamental, than analog power amplifier, the way of working is totally different.Line 5, horn wiring use audio control within 3 meters, line is too long load inductance high breakdown and produce self-induction voltage amplifier chip, long after the horn suggest to consider to add diode (IN5819) for the release of self-induction voltage protection chip.Six basic don't need to add heat sink, 12 v power supply, if the chip temperature is higher than 60 degrees, due to immediately stop work, add heat radiator fan, otherwise the temperature rise will immediately burned chip, the output power of 50 w is recommended to use 5 CM * 1.4 CM * 2.5 CM wide high volume of heat sink.

Warm prompt:The default 36 db gain amplifier board, the computer input can only open 20% volume, because otherwise it will enlarge the serious distortion, power amplifier chip fever and damage, damage the speakers at the same time.Mobile phone input can open 90% volume, because mobile phone audio signal is much weaker than the computer.Computer to open 90% of the volume, must reduce gain amplifier panels, sub board two 20 db gain welding plate.Once the input audio signal is too strong, it is necessary to reduce power amplifier amplification gain, otherwise the amplifier amplification distortion, serious distortion amplification - more than the output power of the power amplifier will damage the chip.

Electronic power supply common sense: 24 v voltage is not directly instantly supply power amplifier boards, because 24 v direct supply power amplifier, the voltage is too high, capacitance is instantaneous short circuit, the current will be big, plus 36 db gain amplifier, capacitor instantaneous current mutation, will be put 36 db amplifier is very big, the power amplifier chip over its power output short-circuit damage and breakdown.Only through a switching power supply, 24 v voltage start to buffer start voltage 24 v, 220 v voltage to refrain from instantaneous large current problems.(24 v battery or lithium batteries, only the VCC pin series 1-2 o 5 w current-limiting resistance, and reduces the problem of the instantaneous electric current too big.)

R&d staff years of experience: 36 db gain, do not recommend using the default zoom capability is too strong, the weak signal in noise is easy to be amplified.Once the input signal is too strong, power amplifier easy distortion, severe distortion amplification - more than its output power will damage the chip.