Recommend Projects

Moving coil cartridge preamp

5 years ago 3157
  • Description
  • Documents
  • BOM
  • Attachments
  • Members
  • Comments


This is a discrete component “Op-amp” using Matrix Geometry Transistors for minimal thermal noise generation. From figure 6 of Diodes Inc. (Zetex) Application Note 23:

A discrete component opamp circuit like this circuit is useful for low noise pre-amplification of uV level signals from low impedance sources (e.g. the head amplifier for a HiFi moving coil pickup cartridge).

A discrete implementation allows the designer to employ relatively large area, high gain input devices. These devices present a low value of base spreading resistance to the input circuit, which minimises the amount of thermal noise generated.

The output of this simple little preamplifier circuit can be connected straight into the moving magnet cartridge (RIAA equalised) input of any HiFi amplifier.

Of course, two channels are required for stereo!



Moving coil cartridge phono preamp


ID Name Designator Footprint Quantity
1 ZTX689B Q1,Q2 SOT23 2
2 ZTX789A Q3 SOT23 1
3 1k R1,R2,R5,R6 R3 4
4 10 R3,R4 R3 2
5 500 R7 R3 1
6 50k R8 R3 1
7 1u C1 1206 1
8 12 V1,V2 BATTERY 2
9 SIN(0 10u 1k) AC 1 0 I1 2P-5.0 1
10 1 RSRC R3 1


The owner does not allow comments in this project now

Comments (0)

如果需要转移工程请在个人中心 - 工程 - 工程高级设置 - 下载工程,下载后在 打开保存即可。
有问题联系QQ 3001956291 不再提醒
svg-battery svg-battery-wifi svg-books svg-more svg-paste svg-pencil svg-plant svg-ruler svg-share svg-user svg-logo-cn svg-double-arrow
We use cookies to offer you a better experience. Detailed information on the use of cookies on this website is provided in our Privacy Policy. By using this site, you consent to the use of our cookies.