Electronic Circuit on Perfboard, San Francisco State College (Alternate View) (Updated two months ago)

You can view this bundle in the SFSU Over the Years collection area.

A small electronic circuit assembled on a perforated prototyping board (perfboard) is shown, featuring discrete components such as resistors, capacitors, and an integrated circuit. The arrangement illustrates hands-on circuit construction and testing in an electronics laboratory setting.

Tags: historic technology

Added to SFSU Over the Years on July 31, 2026.

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Information

  • Identifier: TP-ATA-1888
  • Context: <p><strong data-start="1223" data-end="1272">Function: Analog Comparator or Timing Circuit</strong></p> <p data-start="1273" data-end="1372">This board is a <strong data-start="1289" data-end="1315">more refined prototype</strong>. From the visible components, it looks like it could be:</p> <ul data-start="1374" data-end="1560"> <li data-start="1374" data-end="1427"> <p data-start="1376" data-end="1427">A <strong data-start="1378" data-end="1400">voltage comparator</strong> or <strong data-start="1404" data-end="1427">basic timer circuit</strong></p> </li> <li data-start="1428" data-end="1560"> <p data-start="1430" data-end="1449">Possibly part of a:</p> <ul data-start="1452" data-end="1560"> <li data-start="1452" data-end="1483"> <p data-start="1454" data-end="1483"><strong data-start="1454" data-end="1483">Voltage threshold trigger</strong></p> </li> <li data-start="1486" data-end="1517"> <p data-start="1488" data-end="1517"><strong data-start="1488" data-end="1517">Stability monitoring unit</strong></p> </li> <li data-start="1520" data-end="1560"> <p data-start="1522" data-end="1560">Or even a <strong data-start="1532" data-end="1560">low-frequency oscillator</strong></p> </li> </ul> </li> </ul> <p><strong>Visible Components:</strong></p> <ul data-start="1589" data-end="1838"> <li data-start="1589" data-end="1669"> <h5 data-start="1591" data-end="1669"><strong data-start="1591" data-end="1618">IC (Integrated Circuit)</strong>: Likely an op-amp or comparator (LM741 or similar)</h5> </li> <li data-start="1670" data-end="1723"> <h5 data-start="1672" data-end="1723"><strong data-start="1672" data-end="1685">Resistors</strong>: Used for biasing or voltage division</h5> </li> <li data-start="1724" data-end="1769"> <h5 data-start="1726" data-end="1769"><strong data-start="1726" data-end="1739">Capacitor</strong>: Timing or smoothing function</h5> </li> <li data-start="1770" data-end="1838"> <h5 data-start="1772" data-end="1838"><strong data-start="1772" data-end="1787">Transistors</strong>: Switching control (may serve as an output driver)</h5> </li> </ul> <p><strong>Credits:</strong>&nbsp;</p> <p>Some technical descriptions and historical interpretations were developed with the assistance of ChatGPT, an AI language model by OpenAI.</p>
  • Geographic Coverage: San Francisco, CA
  • Type: Still Image
  • Format: Negative
  • Source: San Francisco State University Archives
  • Rights: Public

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