Wednesday, January 27, 2010
6H9C-6П13С PUSH-PULL TUBE AMPLIFIER
Features:
The output stage: push-pull, class A, with a fixed offset in 6P13S tubes in triode switch.
Output Power - 10.5 W
Band Frequency - 25Hz ... 30kHz
Sensitivity - 0.707V (1V amplitude)
THD - 1.5% (before clipping), 0.8 ... 0.9% (half power)
The level of background noise on the output - 1.5 mV
The output stage: push-pull, class A, with a fixed offset in 6P13S tubes in triode switch.
Output Power - 10.5 W
Band Frequency - 25Hz ... 30kHz
Sensitivity - 0.707V (1V amplitude)
THD - 1.5% (before clipping), 0.8 ... 0.9% (half power)
The level of background noise on the output - 1.5 mV
Monday, January 11, 2010
TUBE DISTORTION
IC1---LM747 dual op-amp, others may be substitued but pinout will differ
IC2---LM340K 12 Voltage Regulator
Bridge Rectifier - Full wave bridge rectifier, 50Volts, 500ma minimum
All resistors 1/2Watt, 10% prefered
Sunday, January 10, 2010
30 W AMPLIFIER FOR CARS
Design by T. Giesberts
[read here...]
ELEKTOR ELECTRONICS MARCH 1995
The power that can be obtained from a standard car radio amplifier operating from a 12 V car battery is 5–6W, which (for many listeners) is not really enough for satisfactory hi-fi reproduction. It is, of course, possible to boost the 12 V supply with a power inverter, but that is fairly expensive and not always acceptable. Now, a Philips IC enables audio power of about 30 W to be obtained from a 12 V car battery. MORE...
Technical Data
Class H operation
Low dissipation with music signals
Extensive protection circuits (output current; temperature; load impedance)
Supply voltage 12 V nominal
Quiescent current 100 mA
Output power
(1 kHz sinusoidal, THD = 0.5%) 30 W r.m.s. into 8 Ω
(music signal) 40 W into 8 Ω
THD + noise (1 W into 8 Ω = 0.05% (20 Hz to 20 kHz)
THD + noise (20 W into 8 Ω = 0.2% (20 Hz to 20 kHz)
Power bandwidth (–3 dB) 5 Hz to 100 kHz.
Monday, January 4, 2010
Power Amplifier 1500W - 4OHMS
This project is mainly in answer to those for whom no amount of power is enough. I have lost count of the number of times people have asked if it's alright to increase the supply voltage on every circuit published, and in general the answer is no - it's not alright. Every design on this site is optimised for the stated power. There is always some flexibility, but you must be very careful to make sure that transistor safe operating area (SOA) is not exceeded. There is also a maximum voltage for any semiconductor, and devices must be selected to ensure they are used within their ratings. MORE...
ONE TUBE BROADCASTER
The purpose of this broadcaster is to transmit your favorite music to every AM radio in your home. The transmitting power is so low that it should not bother the neighbors. A common application would be to drive it from the speaker leads of your FM radio, which could then include playing your XM or Sirius to your AM sets, or just your favorite FM station. MORE....
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