RQ-92 National-Panasonic Double Cassette Recorder schematic (Circuit Diagram)

 National/Panasonic RQ92 cassette recorder circuit diagram

Used ICs: AN6552, MN3007, BA3702, TA7240AP

Admiral Color TV schematic (Vintage TV)-Chassis K10 – Hybrid (using transistors and vacuum tubes) -1974 model

 (Hybrid) color TV - Admiral Chassis K10 - Vintage TV - 1974.  Spare component availability will be rare.  Just compare this with modern TV circuits, and feel how much the field of electronics have developed.  There was no integrated circuit (ICs) at that time. 

 The circuit consists of both tubes and transistors (Hybrid type). Tubes are used at its horizontal output and video output stage circuit. Most of these tubes are not available now.  Moreover the circuit boards are  dangerous to handle,  due to very high voltages  present on them,  while the set works. The picture tube is a Shadow Mask type,  need very high voltage,  in the range between 27 KV to 30KV, and have more than 33 alignment points.

 More to say,  these sets are very costlier at that time,  only very rich ones can afford it.  Actually, luxurious piece at that time  too. 

 This was the time, that I entered into this field  of electronics as a professional service technician. I'm 71 now,  and still continues. 

Layout – PWB

Schematic - Full

Circuit diagram-Split

Thomson Stereo Amplifier - DVD player DPL923VD, DPL933VD, DPL943W schematic diagram

 

Nominal output power:  4 x 50W:  2 x 100W

CONTROL / DISPLAY SCHEMATIC DIAGRAM

PT6315, HRM557BC5109, HT48R05

MAIN SCHEMATIC DIAGRAM: 1 OF 3

STA308A, STA515, BA4558F

MAIN SCHEMATIC: 2 OF 3

ES6603SF, BA5954FP, CS5340-C7, BA6289F, SN74AHC1GOBDBV, ES6698FD, M29W160ET70NG

MAIN SCHEMATIC: 3 0F 3

BU4052BF

MEMORY CARD READER SCHEMATIC DIAGRAM

GL816, 74VHC125M, 74LCX138M, 74LVX74MTR, CFCARD4312-23xxx

POWER SUPPLY [SMPS] SCHEMATIC DIAGRAM

L6565, VIPer53