DIYer logo

DIY - you may not save money, but you can earn many ... fun, new knowledge, experience, ... even money at last


star A.C. Devices
star A.C. EMI Filter
star A.C. Spectrum Verion 2
star A.C. Spectrum
star Digital Oscilloscope
star Flat Top A.C.
star Isolation Transformer - Safer Power Supply ?
star Isolation Transformer
star MCB - For Testing
star Relay - Power Failure Manual Reconnection System
star Soft Start Circuit
star Soft Start Circuit 2
star Tube Amplifier
5Z3P, 6N9P, EL34

Useful Info.

star AWG Vs mm

My AV System

star System Info.
star Testing Result 2016-5-14
star Testing Result 2014-7-27

Case Opening

star Cambridge Audio
CA 351C
star KEF Q300 Speaker


star 5z3p 6n9p EL34
Tube Amplifier DIY kit
star AudioQuest USB A-B Forest 1.5m
star B&W 685 S2 speaker
star WireWorld RCA Luna 7 1m

Other DIY

star Medeco Lock Replacement
star Vacuum Pump for RC Oil Damper

Custom Search

Air Vac - Vacuum Pump
RC Cars Oil Damper / Oil Shock Absorber


There are at least Two Famous RC (Radio Control) Toy Brands selling the Air Vaccum Pump for dealing with the bubbles in the Oil Damper.

The cheapest one in the market costs about US$30. However, we can DIY one for less than US$10.

Not good looking ... but it can save your money and time.

bubbles in shock oil

Bubbles in the Shock Oil

DIY Vaccum Pump Shock Oil Diy set of Vaccum
Vacuum Pump Preserver

The Vacuum Pump Preserver only cost US$3.

This vacuum pump is for preserving the Red Wine.

The Glass Bollte with air-tight lid is Free of charge.

You can get one by finishing a jar of Fruit Jam, Honey, etc.

Drill a big hole on the lid for the plug and seal the gap by hot glue.
The video shows the efficiency of eliminating the bubble in the shock oil.