Elektronika MK-61 - today I ordered one NIB
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09-26-2014, 07:41 PM
(This post was last modified: 09-26-2014 11:59 PM by jebem.)
Post: #29
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RE: Elektronika MK-61 - today I ordered one NIB
The Elektronika MK-61 Operations Manual includes the schematic in A3 paper format.
It was a nice feature from the old CCCP/USSR manufacturing plants, allowing the owners to peek around and do their own repairs if they wanted to. From the schematics, we can identify the following main components. IC's: D1: К745ИК1302-2 (K745IK1302-2) - Control Unit for Processor, Display and Keyboard; D2: К745ИК1303-2 (K745IK1303-2) - Arithmetic Processor; D3: К745ИР2-2 (K745IR2-2) - Memory Registers; D4: К745ИР2-2 (K745IR2-2) - Memory Registers; D5: К745ГФ3-2 (K745GF3-2) - Clock Generator. D6: К745ИК1306-2 (K745IK1306-2) - Additional MK-61 Processor features not present on the B3-34 series; The VFD: VL1: ИЛЦ2-12/8Л (ILC2-12/8L or ILZ2-12/8) - Vacuum Fluorescent Display. Filament voltage: 2.15 - 2.9 V. Filament current: 20 - 24mA. Brightness: 700 cd/m^2. Number of sign: 12 (including 8+2 digit sign). Size of the sign: 2.4 x 4.3 mm. Color: Green. Lifetime: more than 10000 hours. The Transistors: VT1: кт361г (KT361G) - PNP Si 250MHz, hfe>50, 35V, 0.05A, 0.15W VT2: кт315б (KT315B) - NPN Si 250MHz, hfe>50, 20V, 0.1A, 0.15W (schematics diagram wrongly present it as PNP); VT3: кт814г (KT814G) - PNP Si 3MHz, hfe>60, 50V, 3A, 10W VT5: кт315б (KT315G) - NPN Si 250MHz, hfe>50, 35V, 0.1A, 0.15W The printed schematics was scanned at 300dpi in grey, and cropped in 6 overlapping parts to maintain the resolution after the upload. Jose Mesquita RadioMuseum.org member |
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