REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Saturday, 2 February 2019

VELODYNE CHT8, VELODYNE CHT10 – AUDIO - VIDEO SUBWOOFER SYSTEM AMPLIFIER SCHEMATIC

Velodyne CHT8, Velodyne CHT10 – Audio - Video Subwoofer System amplifier schematic

Semiconductors used: TIP31C, TIP32C, UpcC1237HA, BA4558
  True sub-woofers operate at extremely low frequencies which are primarily omni-directional. While it is recommended that the sub-woofers be placed on the same plane as the satellite speakers, room and system conditions often dictate otherwise. Keep in mind that frequency response and output level can be drastically influenced by placement, depending on the acoustic properties of the listening room. Typically, the optimum location for a sub-woofer is tucked away in a corner of your listening room.
  This location will usually offer the greatest output levels and optimum low frequency extension. The worst location for a sub-woofer it typically far away from any walls, and close to the center of your room. Avoid these locations when possible. When using a pair of Velodyne sub-woofers in stereo, it is preferable to place each sub-woofer by the satellite of the same channel. Typically, a minimum distance of 1 to 2 feet from your TV to the sub-woofer will be adequate to avoid any magnetic interference.

Built-in 130 watt (RMS) power amplifier (CHT-8)
Built-in 150 watt (RMS) power amplifier (CHT-10)
Built-in 170 watt (RMS) power amplifier (CHT-12)
Sub-woofer Direct - switchable crossover bypass
Adjustable (40 to 120Hz) low-pass crossover
Selectable (80 or 100Hz) high-pass crossover (CHT-12)
85 Hz high-pass crossover (CHT-80/CHT-10)
Line-level inputs and outputs
Speaker-level inputs and outputs
Signal sensing auto turn on/off with bypass option
Variable volume control
Selectable phase control (0 or 180 degrees)
Dual staggered low-pass crossover; 12dB/octave initial, 24dB/octave ultimate
Anti-clipping circuit
Over excursion protection.
  During normal conditions, the sub-woofer may be left on continuously without any problems. The unit is equipped with a signal sensing circuit that will automatically turn on the unit when a signal is present at the inputs and turn off the unit after several minutes when there is no longer any signal at the inputs.
Circuit diagram
Specifications
Click on the schematic
Posted By: FRANK at 07:01
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