Индикатор уровня КР1534ПП4, Ремонт, USB питание

This video shows an interesting repair of a homemade VU meter (level indicator) for a PC, based on a ready-made fluorescent indicator from a Mayak tape recorder. The heart of the indicator, a specialized KR1534PP4 microcircuit, had damaged input circuits on one channel. It's very difficult to find a new KR1534PP4 microcircuit these days. The input switch was implemented using external components, and control was taken from the indicator grid controls. The indicator's operation was fully restored. In the video, an attempt was made to use the internal additional switch described in the KR1534PP4 microcircuit documentation. I'll explain how to power this level indicator from 5V and use a USB port for power. ⏰ Temporary Contents: 00:00 Introduction 02:09 Homemade Design Overview 07:13 5V USB Power Module 11:05 Testing the KR1534PP4 Input Switch 14:07 Trying to Use an Additional Internal Switch 16:43 Making a Switch Using External Components 19:44 Testing the Indicator After Repair 21:55 Summary and Conclusions Documentation and Schematics: https://drive.google.com/file/d/1WwIi... 3D Printer Corner Stop Project: https://www.printables.com/model/9265... Hilink DC Power Module A0515S-2WR3 https://s.click.aliexpress.com/e/_DE2... DC Power Supply Module B0505S-1WR2 https://s.click.aliexpress.com/e/_DDi... 2N7002 Transistors: https://s.click.aliexpress.com/e/_Dm9... Zener Diodes: https://s.click.aliexpress.com/e/_DlT... SMD Resistor Set: https://s.click.aliexpress.com/e/_DDG... SMD Capacitor Set: https://s.click.aliexpress.com/e/_DkP... #КР1534ПП4#КР1534ПП3#repair#VU meter#VU indicator#