bauer 600

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paul
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bauer 600

Post by paul »

Hi,

Anybody knows anything about a projector bauer 600? I'm familiar with the 610 type. Is the 600 more or less the same?/

Thanks,

Paul
Pedro
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Post by Pedro »

It appears to be the same, but it´s totally differnt.

1. no DC motor, can not be regulated, framerate change with belt
2. no microcomputer
3. diferent gate
4. diferent amplifyer, with a circuit bug that causes major hum at louder volume. Bauer tryed to correct this with compensation coils, but could not eliminate the hum totally.
5. no connection for the external monitor

Pedro
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paul
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Post by paul »

Hi Pedro,

So, for your synchroniser this machine (600) is of no use. good to know.
By the way, for the use of another type of Bauer projector (say the 610) you said somewhere that a few modifications have to be made in the Bauer. I was just wondering if they are very complex and if you supply clear instructions with the synchroniser for the modification of the projector.

Did anyone else make these modifications..difficult??

thanks,

Paul
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Post by Guest »

hi Paul,
for the projector modification, you need the kit B1008S. This kit contains a printed board with an electronic circuit you simply slide into the projector. It fits without any screws above the motor. This circuit has to be soldered with a soldering iron to the motor control board, mounted on the top of the motor. The cables are just prepared and color coded.
Another cable from the circuit has to be soldered to the 3 free pins of the tape remote control socket. This socket will then serve as sync socket.
As a last step, the lamp connector has to be removed from the main switch and to be plugged into the new connector coming from the circuit.
The circuit will now interface to the P1008, providing the frame reference pulses (12 per frame) and influencing the pitch voltage for motor control.
At the same time it controls the lamp and switches it off when waiting for audio pulses in stand by postion, or when the motor regulation should run under 8 fps in case of fault.

All steps are photographed and explainded clearly in the manual included in the B1008S kit.
To do the conversion, you should know how to use a soldering iron in electronic environment, but it is not complicated.

Who just did the conversion successfully is Konton. Ask him!
Note, that you need the synchronizer P1008 or P1008Q (with crystal) plus the projector interface B1008S.

Pedro
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paul
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Post by paul »

At the same time it controls the lamp and switches it off when waiting for audio pulses in stand by postion, or when the motor regulation should run under 8 fps in case of fault.
Does this mean that the projektor will stop/start when there aren't /are pulses, or only the bulb; I Mean: does the synchroniser has a start/stop function?
Pedro
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Post by Pedro »

Yes, the start stop funcionality is almost inherent. THe synchronizer influences the motor speed by overlaying an external DC voltage at the target input of the motor control circuit. If this voltages goes to 2.8 V, the motor stops. Between 1 and 2 V, the motor runs at the desired speeds. So, if there are no pulses at the synchronizers input, AND the synchronizer is set to sync mode, it will output 2.8 V to keep the motor stopped (and the lamp off), when the projector is in foreward projection mode.

When the first pulse arrives, the synchronizer turns off that 2,8 V and applies the correct regulation voltage for the standard speed (18 or 24 fps), making the projector start off at standard speed. The lamp goes on, when the speed overrides 8 fps. For max security, the lamp only depends on the framerate.
THen the synchronizer is currently analyzing, if the normal projector speed is o.k. for keeping the film in sync with the sound and is applying the neccessary speed alterations, modifying the regulation voltage.
This it can do in 2 fine and 2 course steps. If the sync differnece is only 2 frames off, it accelerates or brakes the speed only very carefully. But if the sync offset should override 2 frames, the regulation is more course, too. (about 15 % over/under nominal speed), until it reaches the 2 frame offset again.

When stopping the tape, the pulse chain is interrupted and the projector will be stopped 200 milliseconds after. However, the mechanical masses will need about 5 frames to stop completly. So, when turning on audio again, the projector will start with a 5 frame positive offset and the synchronizer will compensate this immediately by going to course negative regulation, until the projector is in the 2 frames offset range again.

All regulation ranges are indicated to the user with 5 LEDs, one for each range and one for nominal speed. THe input audio pulses are monitored with another LED, indicating to the user, that the pulses are recognized correctly, and, during editing, where the camera had been shooting on the 45 min audio tape!
You also have a reset button to reset the frame memory. When starting in reset position, the projector will first be controlled at nominal speed. Without reset, it will start with a certain frame offset and trying to compensate this. Good for interruption of a running show and continuing without sync problems!

You see, you won´t have to care about the projector, it follows the audio like a dog it´s master. The max sync offset that the synchronizer can manage is 128 frames up and 128 frames down, far enough for any regulation.
The only drawback is, that during sound transfer to stripe, you must alighn every singular scene start, if your tape is not seemlessly identical with your 50 ft film. And normally, after editing, it´s not.
Alighning is performed by turning the hand knob of the projector until the first frame of the scene appears in the gate. Then start your tape short before the audio really starts, and the projector will join in with the pulse chain.

Pedro
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