Audio Volume Limiter

IC1-a is connected as an inverting amplifier whose gain is controlled by the LDR portion of an optocoupler.

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1N5333B through 1N5388B: 5 Watt Zener Regulator Diodes

5 WATT SURMETIC 40 SILICON ZENER DIODES : This is a complete series of 5 watt zener diodes with tight limits and better operating characteristics that reflect the superior capabilities of silicon-oxide-passivated junctions. All this is in axial-lead, transfer-molded plastic package that offers protection in all common environmental conditions.

Specification Features :

• Up to 180 Watt Surge Rating @ 8.3 ms
• Maximum Limits Quaranteed on Seven Electrical Parameters

For further information, view it online: 1N5333B through 1N5388B (pdf | 6 pages)

1N4148, 1N4150, 1N4448: Switching Diode

• Application : High-speed switching.
• Features : Glass sealed envelope, high speed, high reliability.
• Construction : Silicon epitaxial planar.

      For further information, view it online: 1N4148 (pdf | 3 pages)