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Simple Surround Processor - Simple Surround Processor. This is built with only
conventional parts, and digital delay block, too. So it is very easy to build. (added
10/05) |
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Simple VOX circuit - (circuit added 6/07) |
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Simple warning signal - This power audio oscillator could be used as a warning
signal for alarm systems or to attract attention if something is wrong with an
equipment. The oscillator, about 750Hz, exploits the characteristic of certain NPN
transistors, in this case a BC337, to oscillate if reverse biased and with the base
open....(circuit added 05/08) |
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Simplified Audio Amp Model - ...(spice design added 02/09) |
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SIM-The Simple Version - The smallest variation in amplifier performance is shown
with this simple circuit (circuit added 6/07) |
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Single Amplifier 4 Band Passive EQ - (electronic circuit added 08/08/08) |
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Single Chip 50 Watt/8 Ohm Power Amplifier - Uses National Semiconductor LM3876
Power IC. Voltage gain is 27dB. Voltage gain is 27dB as shown, but this can be
changed by using a different value resistor for the feedback path (R3, currently 22k,
between pins 3 and 9). The inductor consists of 10 turns of 0.4mm enameled copper
wire, wound around the body of the 10 Ohm resistor. The insulation must be scraped off
each end and the wire is soldered to the ends of the resistor. (added 10/05) |
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Single Chip 50 Watt/8 Ohm Power Amplifier sound.ad - Uses LM3876 Hi-Fi amplifier
IC from National Semiconductor (added 6/03) |
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Single Ended Class A2 SV811 10 Stereo Amp - (electronic circuit added 1/03) |
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Single-ended driver for a Circlotron OTL - Originally, this circuit was driving a
6B4G PP output stage. Transformer-coupled, naturally. I started with cap-coupled
Mullard splitter using three 4P1L direct-heated loktal pentodes. Not bad at all, but
had insufficient gain. Then I tried a plain Loftin-White configuration with a LL1660
interstage (this one is a one-of-a-kind custom 30mA version...(schematic added 05/08) |
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Single-Ended OTL Amplifier for Dynamic Headphones - A simple OTL design that uses
just two tubes (dual triodes) for stereo. It has a common cathode input stage
direct-coupled to a cathode follower output stage. Designed by Aren van Waarde
(circuit design added 03/08) |
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Siren circuit - This siren circuit simulates police, fire or other emergency
sirens that produce an up and down wail.…(added 07/07/07) |
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Siren circuit (page 84) - This circuit was requested by several correspondents.
Its purpose was to obtain more power than the siren circuit already available on ...
(added 07/07/07) |
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Small Amplifier Circuit - Uses many amplifier ICs, from few-Watts to200-Watt
(added 4/02) |
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Soft Start Circuit for Power Amps - Designed for (large) toroidal transformers,
limit the inrush current to a sensible value. (diagram added 6/03) |
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Sony C 37Condenser Microphone - information with circuit diagram (added 5/02) |
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Sound Card with PCM2702 - Make a sound card is no more a complex issue. If you use
great IC PCM2702 from BURR BROWN / Texas Instruments you can create a fully functional
USB sound card. This sound card can be…(added 08/08/08) |
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Sound Controlled Flip Flop - Described here is a very inexpensive solution to many
phono-controlled applications like remote switching on, for instance, or activating a
camera, tape recorder, burglar alarms, toys, etc. The circuit given here employs a
condenser microphone as the pick-up. A two-stage amplifier built around a quad op-amp
IC LM324 offers a good gain to enable sound pick-up upto four metres. …. (added
10/05) |
