Jaycar AS3305 Crystal Earpiece – High Impedance, 3.5mm Plug

You're building a crystal set, testing a high-impedance audio circuit, or just want to hear what that old receiver is actually putting out. The Jaycar AS3305 is a high-impedance crystal earpiece with a 3.5mm plug. No power supply. No batteries. Just plug it in and listen. Add to cart and get your bench tests moving

• High-impedance crystal driver – suited to crystal sets and experimental audio
• 3.5mm plug for direct connection, no adapters needed
• No batteries or external power supply required
• Simple, lightweight design for bench testing and experimental use