- 积分
- 210
- 在线时间
- 414 小时
- 最后登录
- 2021-9-19
- 阅读权限
- 50
- 精华
- 0
- UID
- 176744
- 帖子
- 248
- 精华
- 0
- 经验
- 210 点
- 金钱
- 228 ¥
- 注册时间
- 2010-2-27
|
96# 飞音
要把B24甲类化输出要换好几样东西。。。
The output stage unregulated power supply voltage needs to be dropped in half, from ±30V to ±15V, fully loaded. This means using a 12V+12V power transformer (or 24V CT). It should be rated 350VA if using a single transformer for both channels, or use one 200VA transformer per channel. As a consequence of the reduced voltage, the 10000uF bulk capacitors' voltage rating could also be reduced from 50V to 25V. You can use higher capacitance if you wish.
The σ22 regulated power supply should be configured to output ±24V instead of ±36V. The recommended power transformer is thus changed to 25V+25V or 50V CT, rated 30VA if using a single transformer for both channels, or use one 15VA transformer per channel.
R25 and R26 should be changed to 562 ohms.
VR2 and VR3 should be changed to 500 ohms.
R45, R46, R47 and R48 should be mounted to the heatsink as they will get warm.
C1 and C2 should be changed to 2.0pF (e.g., Mouser 81-RPE5CA2R0C2P1B03B or Digi-key 490-3633-ND)
C3, C4, C5 and C6 should be changed to 18pF (e.g., Mouser 81-RPE5CA180J2P1Z03B or Digi-key 490-3632-ND).
C15A-C15D and C16A-C16D may (optionally) be changed to Panasonic TS-HA ECO-S1HA272CA 2700uF, 50V caps (Digi-key P6677-ND).
D1-D6, D11 and D12 should be changed to BZX55C6v2 (6.2V 500mW zener).
D7, D8, D9 and D10 should be changed to 1N5927B (12V 3W zener). |
|