Advanced Analog Pumpkin Lamp

A lamp and loudspeaker in a pumpkin controlled by music or voice.

Gregor Ruf

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Description

The goal of this project was to create a circuit that can modulate the intensity of a 12V lamp with a line audio input and a microphone input. It should also be able to drive a loudspeaker. Both the Loudspeaker and lamp will be put into a Halloween pumpkin. This should allow me to place the pumpkin in front of my house and talk remotely via the pumpkin (as if the pumpkin was talking). Additionally, I need to hear the people outside to interact with them. For this, I also head to design a microphone preamp with AGC (Automatic gain control). The goal was to implement everything with analog circuits, and even without using integrated circuits (ICs). So I built everything from scratch just with undead tech from the past.

Details

Here you can find a video in which I walk you through my project.

Files

Main_Control_Assembly_Schematic_v01.pdf Schematic of the Microphone Main Assembly Adobe Portable Document Format - 53.98 kB - 10/26/2021 at 14:24	Preview	Download

Microphone_Preamp_Schematic_v01.pdf Schematic of the Microphone preamplifier Adobe Portable Document Format - 41.18 kB - 10/26/2021 at 14:24	Preview	Download

Block_Diagram.png Block diagram of the project Portable Network Graphics (PNG) - 153.80 kB - 10/26/2021 at 12:54	Preview	Download

BOM_v01.pdf BOM of the project Adobe Portable Document Format - 182.02 kB - 10/26/2021 at 14:32	Preview	Download

Components

16 × BC547C RF, IF, RFID, ZigBee Semiconductors and ICs / Transistors and FETs
8 × BC557C Discrete Semiconductors / Transistors, MOSFETs, FETs, IGBTs
1 × J113 Discrete Semiconductors / Transistors, MOSFETs, FETs, IGBTs
1 × 12V Lamp
5 × 1N4148 Discrete Semiconductors / Diodes and Rectifiers

View all 15 components

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This was my first SSTC project, intended to be audio-modulated by a PWM interrupter signal and upgradable to a Double-Resonant SSTC.

Advanced Analog Pumpkin Lamp

Description

Details

Files

Main_Control_Assembly_Schematic_v01.pdf

Microphone_Preamp_Schematic_v01.pdf

Block_Diagram.png

BOM_v01.pdf

Components

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Advanced Analog Pumpkin Lamp

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