LM324 quad op-amp pinout
DIP-14. Four general-purpose op-amps on a single or split supply
On the Electron (IC13) it is the cassette interface, run from +5 V on pin 4 and -5 V on pin 11. Amplifier 1 is a follower: ULA CAS OUT (pin 50) through R23 100K into pin 3, out on pin 1 through C19 to tape socket pins 1 and 4. Amplifiers 2, 3 and 4 amplify and square the tape input; pin 14 feeds ULA CAS IN (pin 59) through C7. Service manual test: press BREAK and measure pins 7, 8 and 14; over 100 mV on any of them means replace it. A missing -5 V also kills the tape: check the PSU first.
Open the interactive LM324 pinoutPins
| Pin | Name | Type | Signal |
|---|---|---|---|
| 1 | 1OUT | audio | Amplifier 1 output. |
| 2 | 1IN- | audio | Amplifier 1 inverting input. |
| 3 | 1IN+ | audio | Amplifier 1 non-inverting input. |
| 4 | VCC+ | power | Positive supply (3 to 32 V single, or the + rail of a split supply). |
| 5 | 2IN+ | audio | Amplifier 2 non-inverting input. |
| 6 | 2IN- | audio | Amplifier 2 inverting input. |
| 7 | 2OUT | audio | Amplifier 2 output. |
| 8 | 3OUT | audio | Amplifier 3 output. |
| 9 | 3IN- | audio | Amplifier 3 inverting input. |
| 10 | 3IN+ | audio | Amplifier 3 non-inverting input. |
| 11 | VCC- | power | Negative supply: ground on a single supply, the - rail on a split one. |
| 12 | 4IN+ | audio | Amplifier 4 non-inverting input. |
| 13 | 4IN- | audio | Amplifier 4 inverting input. |
| 14 | 4OUT | audio | Amplifier 4 output. |
Fitted in
- Acorn Electron IC13