Tanker135E
New Member
Ok guys I will try to explain the thingy/T-1 This is the throttle 1 = 1amp 2 =2amps so on. Then I'll get a schematic posted. The basic principals of operation is that of a "tone link" 4 tones per each T-1 and maximum of 80 tones, max engines 20. The integrated circuit is that of a tone decoder, these devices are members of a family of circuits know as "phase locked loops" each tone is 6% apart to prevent cross talk. The rails carry the tones and the voltage set at 14v. A crystal oscillator is used (digital) to run the system at 3.58 Megahertz. This is is about the fastest we could use with (cmos). The system works from a mixer which take 18v AC from a transformer and rectifies it to dc voltage by means of a LM380 audio amplifier. The tone signals appear on the track as signals with one volt peak to peak amplitude. Key pads are use to control the tones to the T-1 these contain digital electronic circuits and a crystal controlled oscillators and a 20 position switch to control the channel. The T-1 operates from a well controlled build in 5v power supply so not to be affected by track voltage changes. The main part of the control circuitry is an integrator 5v = full fwd, 0v = full rev 2.4 to 2.6 is off. The out put is a combined triangular wave. The T-1 has a H bridge built in it. (very late versions had a L272m IC maybe the answer to my question???)
What has been a problem with it use, is that the T-1 gets hot as most of the time a train is running one direction for a long time.And it burns up. A guy back in 1994 came up with the circuit back in the first post that made the T-1 a preamp and it took all the heat eliminating T-1 failure! The T-2,4 throttles did not have the same problems as they were meant for much larger scale trains and they had the room to make the circuitry much larger and there by able to protect it. I hope this clears some questions. steve
What has been a problem with it use, is that the T-1 gets hot as most of the time a train is running one direction for a long time.And it burns up. A guy back in 1994 came up with the circuit back in the first post that made the T-1 a preamp and it took all the heat eliminating T-1 failure! The T-2,4 throttles did not have the same problems as they were meant for much larger scale trains and they had the room to make the circuitry much larger and there by able to protect it. I hope this clears some questions. steve
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