Difference between revisions of "AudioAmp380"
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* J3 - Power, 10V-22VDC | * J3 - Power, 10V-22VDC | ||
| − | == Rev | + | == Rev 1 Schematic == |
[[file:AudioAmp380-Rev1_Schematic.png]] | [[file:AudioAmp380-Rev1_Schematic.png]] | ||
Revision as of 16:54, 1 November 2021
Contents
Design
- Pre-amp plus power amp
- 50 Ohm input impedance matched Product Detector outputs
- Gain trimmer potentiometer on preamp
- External mount gain potentiometer
- NE5534 Pre-amplifier
- LM380 2.5W Audio Power Amplifier
- 12V nominal power
- 10-22V
- Fits into 80x50x20mm extruded aluminum enclosure
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Pre-Amplifier (NE5534)
- Low-Noise Operational Amplifiers
- Equivalent Input Noise Voltage 3.5 nV/√Hz Typ
- Unity-Gain Bandwidth 10 MHz Typ
- Common-Mode Rejection Ratio 100 dB Typ
- Wide Supply-Voltage Range ±3 V to ±20 V
- Used as single supply
Audio Power Amplifier (LM380)
- Wide Supply Voltage Range: 10V-22V
- Low Quiescent Power Drain: 0.13W (VS= 18V)
- Voltage Gain Fixed at 50 (34 dB)
- High Peak Current Capability: 1.3A
- Input Referenced to GND
- High Input Impedance: 150kΩ
- Low Distortion
- Quiescent Output Voltage is at One-Half of the Supply Voltage
Controls
- RV1 - trade-off gain/bandwidth - Tune for best sound
- RV2 - volume control (after preamp and before LM380 Amp). 1x5 header wire to external pot
- J1 - Audio In, 50 Ohms input impedance
- J2 - Audio Out, 8 Ohm speakers
- J3 - Power, 10V-22VDC
Rev 1 Schematic
LM380 Equivalent Schematic
Rev 2 Schematic
Rev 1 Rework
- Issues
- FPre-amp opamp has + and - reversed
- Also hooked up the feedback to the wrong input
- Replace R1 with wire jumper
- Replace C9 with wire jumper
- Remove C2
- 5 Cuts
- 4 on front
- 1 on back
- 5 jumper segments on back
- 2 nodes
- Jumpers on rear side
Videos
